-63.75% is the change from 251 to 91
Calculation steps:
[( 91 - 251 ) ÷ 251] x 100 = -63.75%
Formula
Percentage change = [(91 - 251) / 251] x 100
Subtract the new number by the original number
91 - 251 = -160
-160 ÷ 251 = -0.6374501992031872
-0.6374501992031872 x 100 = -63.75%