-14.34% is the change from 251 to 215
Calculation steps:
[( 215 - 251 ) ÷ 251] x 100 = -14.34%
Formula
Percentage change = [(215 - 251) / 251] x 100
Subtract the new number by the original number
215 - 251 = -36
-36 ÷ 251 = -0.14342629482071714
-0.14342629482071714 x 100 = -14.34%