-18.1% is the change from 210 to 172
Calculation steps:
[( 172 - 210 ) ÷ 210] x 100 = -18.1%
Formula
Percentage change = [(172 - 210) / 210] x 100
Subtract the new number by the original number
172 - 210 = -38
-38 ÷ 210 = -0.18095238095238095
-0.18095238095238095 x 100 = -18.1%