-9.52% is the change from 210 to 190
Calculation steps:
[( 190 - 210 ) ÷ 210] x 100 = -9.52%
Formula
Percentage change = [(190 - 210) / 210] x 100
Subtract the new number by the original number
190 - 210 = -20
-20 ÷ 210 = -0.09523809523809523
-0.09523809523809523 x 100 = -9.52%