-72.73% is the change from 187 to 51
Calculation steps:
[( 51 - 187 ) ÷ 187] x 100 = -72.73%
Formula
Percentage change = [(51 - 187) / 187] x 100
Subtract the new number by the original number
51 - 187 = -136
-136 ÷ 187 = -0.7272727272727273
-0.7272727272727273 x 100 = -72.73%