-73.65% is the change from 816 to 215
Calculation steps:
[( 215 - 816 ) ÷ 816] x 100 = -73.65%
Formula
Percentage change = [(215 - 816) / 816] x 100
Subtract the new number by the original number
215 - 816 = -601
-601 ÷ 816 = -0.7365196078431373
-0.7365196078431373 x 100 = -73.65%