-71.01% is the change from 645 to 187
Calculation steps:
[( 187 - 645 ) ÷ 645] x 100 = -71.01%
Formula
Percentage change = [(187 - 645) / 645] x 100
Subtract the new number by the original number
187 - 645 = -458
-458 ÷ 645 = -0.710077519379845
-0.710077519379845 x 100 = -71.01%