-72.58% is the change from 186 to 51
Calculation steps:
[( 51 - 186 ) ÷ 186] x 100 = -72.58%
Formula
Percentage change = [(51 - 186) / 186] x 100
Subtract the new number by the original number
51 - 186 = -135
-135 ÷ 186 = -0.7258064516129032
-0.7258064516129032 x 100 = -72.58%