https://www.thecrimson.com/article/2019/2/22/record-applicants-admissions-2019/
Here are some numbers: EA: 6958; RD: 36372 (=43330 total)
Using last year’s EA deferral rate of 73.6% you have total number of applications in regular round:
6958x73.6%+36372=41493
With about 2000 total admission offers and 935 already sent in REA the acceptance rate in RD is going to be about:
1065/41493=2.57%, which is almost exactly the same as last year’s.