One argument for Ye Shiwen's "doping" accusation (or speculation) was her performance improved by 7 seconds within one year, and this, according to some, is "physically impossible".
Now thanks for newly available data, Ye's "unbelievable" improvement doesn't rank her as a top 10. Stephanie Rice, for example, improved her performance by more than 12 seconds in one year; Camille Muffat, the new French champion, improved by 10.2 seconds. Both in women's 400 medley.
Here is some comprehensive data where you can find swimmer's performance within the past 1-2 years
Big Data Analysis of Swimming Athletes' Performance Records
Enjoy.