Adult tube site xHamster released its first comprehensive survey of porn viewership in 2016. According to them the most visited category moved from MILFs to Matures (women in their 40s and 50s). They also found that searches for "Melania" beat out "Donald Trump" and "Hillary Clinton" combined.
Using data from over 2 billion visits worldwide, they found that these were the top searches by country.
Lots more info over on their blog, including tons of information on their female users worldwide and LGBTQ trends.
• xHamster presents 2016: The Year in Porn, (thanks Mike Stabile!)