One of my favorite days of the year at Fortune is MPW day, the day the list of Fortune‘s Most Powerful Women in business comes out. It’s a great celebration of women in power, of women in business generally, and of course it’s always great fun to see how the world reacts to the MPW team’s picks—who’s on, who’s off, who jumped to the top of the list, who fell, who’s brand-new. But beyond these highlights, one of the things I love is the general trends you can pick up by pulling the camera back and looking at how the list changes and evolves over the years.  Link>>