From Dec 2010 to Oct 2014, Python fell massively, from 6.482 down to 2.333. In contrast, Perl went from 2.332 to 2.116. That is, Perl "outperformed" Python over the past four years by falling only 10%, rather than 178%. Now, if that rate of change continues...

Having said that, I was saddened that all four of my favorite languages (Perl, Python, Ruby, C++) fell during the past four years (I was not saddened that PHP suffered an even bigger fall than Python :). Most of the popular languages fell, with only C and Objective-C improving.