-18.87% is the change from 212 to 172
Calculation steps:
[( 172 - 212 ) ÷ 212] x 100 = -18.87%
Formula
Percentage change = [(172 - 212) / 212] x 100
Subtract the new number by the original number
172 - 212 = -40
-40 ÷ 212 = -0.18867924528301888
-0.18867924528301888 x 100 = -18.87%