-77.2% is the change from 921 to 210
Calculation steps:
[( 210 - 921 ) ÷ 921] x 100 = -77.2%
Formula
Percentage change = [(210 - 921) / 921] x 100
Subtract the new number by the original number
210 - 921 = -711
-711 ÷ 921 = -0.7719869706840391
-0.7719869706840391 x 100 = -77.2%