This is the best healthcare news I've heard in a while: Reversing Trend, Big Drop Is Seen in Breast Cancer (link is to the New York Times, but this news is everywhere). From the article:
The reason, they believe, may be because during that time, millions of women abandoned hormone treatment for the symptoms of menopause after a large national study concluded that the hormones slightly increased breast cancer risk.
For a great discussion of this issue, and some quibbling with the numbers used by the New York Times, visit Dr. Charles.