-15.54% is the change from 251 to 212
Calculation steps:
[( 212 - 251 ) ÷ 251] x 100 = -15.54%
Formula
Percentage change = [(212 - 251) / 251] x 100
Subtract the new number by the original number
212 - 251 = -39
-39 ÷ 251 = -0.1553784860557769
-0.1553784860557769 x 100 = -15.54%