-20.74% is the change from 217 to 172
Calculation steps:
[( 172 - 217 ) ÷ 217] x 100 = -20.74%
Formula
Percentage change = [(172 - 217) / 217] x 100
Subtract the new number by the original number
172 - 217 = -45
-45 ÷ 217 = -0.2073732718894009
-0.2073732718894009 x 100 = -20.74%