-37.12% is the change from 819 to 515
Calculation steps:
[( 515 - 819 ) ÷ 819] x 100 = -37.12%
Formula
Percentage change = [(515 - 819) / 819] x 100
Subtract the new number by the original number
515 - 819 = -304
-304 ÷ 819 = -0.3711843711843712
-0.3711843711843712 x 100 = -37.12%