-74.76% is the change from 820 to 207
Calculation steps:
[( 207 - 820 ) ÷ 820] x 100 = -74.76%
Formula
Percentage change = [(207 - 820) / 820] x 100
Subtract the new number by the original number
207 - 820 = -613
-613 ÷ 820 = -0.7475609756097561
-0.7475609756097561 x 100 = -74.76%