-19.92% is the change from 251 to 201
Calculation steps:
[( 201 - 251 ) ÷ 251] x 100 = -19.92%
Formula
Percentage change = [(201 - 251) / 251] x 100
Subtract the new number by the original number
201 - 251 = -50
-50 ÷ 251 = -0.199203187250996
-0.199203187250996 x 100 = -19.92%