he did last year, probably he didn't it this time because he has not been playing already a long time
No, he didn't.
He only did it in 2010 and the difference between him and Federer was very small. Rafa had 42% of the votes and Fed 47%.
Last year the difference between Federer and the rest was probably huge. That's why they didn't even mention the percentages. It would have been a bit embarassing.