-13.15% is the change from 251 to 218
Calculation steps:
[( 218 - 251 ) ÷ 251] x 100 = -13.15%
Formula
Percentage change = [(218 - 251) / 251] x 100
Subtract the new number by the original number
218 - 251 = -33
-33 ÷ 251 = -0.13147410358565736
-0.13147410358565736 x 100 = -13.15%