-21.9% is the change from 210 to 164
Calculation steps:
[( 164 - 210 ) ÷ 210] x 100 = -21.9%
Formula
Percentage change = [(164 - 210) / 210] x 100
Subtract the new number by the original number
164 - 210 = -46
-46 ÷ 210 = -0.21904761904761905
-0.21904761904761905 x 100 = -21.9%