-16.73% is the change from 251 to 209
Calculation steps:
[( 209 - 251 ) ÷ 251] x 100 = -16.73%
Formula
Percentage change = [(209 - 251) / 251] x 100
Subtract the new number by the original number
209 - 251 = -42
-42 ÷ 251 = -0.16733067729083664
-0.16733067729083664 x 100 = -16.73%