-20.95% is the change from 210 to 166
Calculation steps:
[( 166 - 210 ) ÷ 210] x 100 = -20.95%
Formula
Percentage change = [(166 - 210) / 210] x 100
Subtract the new number by the original number
166 - 210 = -44
-44 ÷ 210 = -0.20952380952380953
-0.20952380952380953 x 100 = -20.95%