-74.15% is the change from 820 to 212
Calculation steps:
[( 212 - 820 ) ÷ 820] x 100 = -74.15%
Formula
Percentage change = [(212 - 820) / 820] x 100
Subtract the new number by the original number
212 - 820 = -608
-608 ÷ 820 = -0.7414634146341463
-0.7414634146341463 x 100 = -74.15%