There are 56 self-made women billionaires in the world according to a new list released by Forbes on International Women's Day. And while the number pales in comparison to the hundreds of self-made male billionaires, Forbes' data shows that women are increasing their wealth at a rapid rate.

The number of self-made women billionaires has "more than doubled" since 2009. In the past year alone, 15 women--or 26 percent--became self-made billionaires.

They are also the richest they have ever been. According to the publication, the total wealth among self-made women billionaires "increased 50 percent in the past five years."

The list includes some well-known names: Oprah (No. 11), Facebook's Sheryl Sandberg (No. 42), Spanx's Sara Blakely (No. 48) and Marian Ilitch (No. 2), who owes her fortune largely to the Little Caesars pizza chain she started with her late husband.

Self-made billionaire Zhou Qunfei tops the list at No. 1. She became one after her company, Lens Technology, went public in 2015. Her business makes glass covers for smartphones and tablets for clients including Apple and Samsung.

Of course, the ladies on the list still dwarf their male counterparts. Zhou's reported fortune at $7.4 billion is just about 10 percent of Bill Gates's $75 billion, for instance. Non-billionaires also still suffer a gender pay gap--earning roughly 80 cents on every male dollar. Still, the trend lines should be heartening. 

Here's the complete list from Forbes; Individual fortunes founded with a current spouse are noted with an asterix*

1. Zhou Qunfei, $7.4B; Citizenship: Hong Kong; Source of Wealth: smartphone screens

2. Marian Ilitch & family, $6B; Citizenship: United States; Source of Wealth pizza, sports team

3. Chan Laiwa & family, $5.6B; Citizenship: China; Source of Wealth: real estate

4. Pollyanna Chu, $4.9B; Citizenship: Hong Kong; Source of Wealth: financial services

5. Wu Yajun & family, $4.5B; Citizenship: China; Source of Wealth: real estate

6. Lam Wai Ying, $4.1B; Citizenship: Hong Kong; Source of Wealth: smartphone screens

7. Diane Hendricks, $3.9B; Citizenship: United States; Source of Wealth: roofing

8. Rafaela Aponte, $3.75B; Citizenship: Switzerland; Source of Wealth: shipping *

9. Denise Coates, $3.6B; Citizenship: United Kingdom; Source of Wealth: online gambling

10. Zhang Xin & family, $3.2B; Citizenship: China; Source of Wealth: real estate

11. Oprah Winfrey, $3B; Citizenship: United States; Source of Wealth: TV shows

12. Zhang Xiaojuan, $2.9B; Citizenship: China; Source of Wealth: logistics

13. Giuliana Benetton, $2.7B; Citizenship: Italy; Source of Wealth: fashion retail, investments

13. Johnelle Hunt, $2.7B; Citizenship: United States; Source of Wealth: trucking

13. Rita Tong Liu, $2.7B; Citizenship: Hong Kong; Source of Wealth: real estate

16. Doris Fisher. $2.6B; Citizenship: United States; Source of Wealth: Gap

16. Lei Jufang, $2.6B; Citizenship: China; Source of Wealth: pharmaceuticals

16. Judy Love, $2.6B; Citizenship: United States; Source of Wealth: retail, gas stations *

19. Judy Faulkner, $2.4B; Citizenship: United States; Source of Wealth: health IT

19. Cristina Green, $2.4B; Citizenship: United Kingdom; Source of Wealth: Topshop, retail *

21. Meg Whitman, $2.3B; Citizenship: United States; Source of Wealth: eBay

22. Hedda im Brahm Droege, $2.1B; Citizenship: Germany; Source of Wealth: consulting

22. Kiran Mazumdar-Shaw, $2.1B; Citizenship: India; Source of Wealth: biotech

22. Zhao Yan, $2.1B; Citizenship: China; Source of Wealth: real estate, finance

25. Maritsa Lazari & family, $2B; Citizenship: United Kingdom; Source of Welth: real estate

25. Wu Lanlan & family, $2B; Citizneship: China; Source of Wealth: packaging

25. Lynda Resnick, $2B; Citizenship: United States; Source of wealth: agriculture *

28. Chu Lam Yiu, $1.9B; Citizenship: Hong Kong; Source of Wealth: flavorings

29. Dulce Pugliese de Godoy Bueno, $1.8B; Citizenship: Brazil; Source of Wealth: hospitals, health care

29. He Qiaonv, $1.8B; Citizenship: China; Source of Wealth: landscape architecture

29. Gail Miller, $1.8B; Citizenship: United States; Source of Wealth: basketball, car dealers

29. Elaine Wynn, $1.8B; Citzenship: United States; Source of Wealth: casinos, hotels

33. Chen Xiaoying, $1.7B; Citizenship: China; Source of Wealth: logistics

33. Wang Laichun, $1.7B; Citizenship: China; Source of Wealth: electronics components

35. Laura Dangermond, $1.6B; Citizenship: United States; Source of Wealth: mapping software*

35. Folorunsho Alakija, $1.6B; Citizenship: Nigeria; Source of Wealth: oil

35. Cheung Yan, $1.6B; Citizenship: China; Source of Wealth: paper manufacturing

35. Thai Lee, $1.6B; Citizenship: United States; Source of Wealth: IT provider

35. Su Suyu & family, $1.6B; Citizenship: China; Source of Wealth: utilities

40. Peggy Cherng, $1.55B; Citizenship: United States; Source of Wealth: Panda Express *

41. Chen Liying, $1.5B; Citizenship: China; Source of Wealth: logistics

42. Sheryl Sandberg, $1.4B; Citizenship: United States; Source of Wealth: Facebook

42. Jin Sook Chang, $1.4B; Citizenship: United States; Source of Wealth: Forever 21 *

44. Ma Xiuhui, $1.3B; Citizenship: China; Source of Wealth: LED lighting

45. Li Tan, $1.2B; Citizenship: China; Source of Wealth: pharmaceuticals

45. Nguyen Thi Phuong Thao, $1.2B; Citizenship: Vietnam; Source of Wealth: airlines

45. Tang Jianfang, $1.2B; Citizenship: China; Source of Wealth: packaged foods

48. Sara Blakely, $1.1B; Citizenship: United States; Source of Wealth: Spanx

48. Chen Baozhen, $1.1B; Citizenship: China; Source of Wealth: internet services

48. Cheng Xue, $1.1B; Citizenship: China; Source of Wealth: soy sauce

48. Fan Zhaoxia, $1.1B; Citizenship: China; Source of Wealth: photovoltaic equipment

48. Judith Neilson, $1.1B; Citizenship: Australia; Source of Wealth: investments

48. Lucy Peng, $1.1B; Citizenship: China; Source of Wealth: Alibaba

48. Yoshiko Shinohara, $1.1B; Citizenship: Japan; Source of Wealth: staffing

55. Elena Baturina, $1B; Citizenship: Russia; Source of Wealth: construction

55. Zhou Yifeng & family, $1B; Citizenship: China; Source of Wealth: liquefied petroleum gas