Who made it onto this year's female Power List?

For the past nine years, Forbes magazine has released an annual list of the world's 100 most powerful women. Based on public visibility and economic impact, it's a snapshot of the women making a difference worldwide in 2012. This year's list includes eight heads of state, 25 CEOs, dozens of entrepreneurs and a smattering of celebrity philanthropists.

Click through to see who made it into this year's Top 20...