If you're interested in popularity, versus change in popularity, see the "Very Long Term History" section of the website. The consistent winner is C, which was

If you're interested in popularity, versus change in popularity, see the "Very Long Term History" section of the website. The consistent winner is C, which was the ranked number 1 or 2 in each of the eight report pentads. C# seems to be settling into the number 5 or 6 spot. Working with differences can be tricky. So can working with ranks. Luckily, the site provides an interactive graph of index versus time for various languages, so readers can make their own decisions. I'm not sure I care what is popular to the general community. I use multiple languages in my work, different ones for different things. Fortran and Scratch are like hammers and screw drivers: they are both handy, just for different things. The same for many of the languages in the listing.