There is such data available on the AIP website, but of course it doesn't include data for this current round of admissions. But, just to give an estimate, according to grad school shopper, Berkeley had 713 applicants last year. This year, according to the letter I received, they had over 720 applicants. MIT had 713 applicants last year, and over 700 this year. These numbers seem to indicate that the number of applicants is pretty similar to what it was last year.