-71.94% is the change from 645 to 181
Calculation steps:
[( 181 - 645 ) ÷ 645] x 100 = -71.94%
Formula
Percentage change = [(181 - 645) / 645] x 100
Subtract the new number by the original number
181 - 645 = -464
-464 ÷ 645 = -0.7193798449612403
-0.7193798449612403 x 100 = -71.94%