-71.16% is the change from 645 to 186
Calculation steps:
[( 186 - 645 ) ÷ 645] x 100 = -71.16%
Formula
Percentage change = [(186 - 645) / 645] x 100
Subtract the new number by the original number
186 - 645 = -459
-459 ÷ 645 = -0.7116279069767442
-0.7116279069767442 x 100 = -71.16%