-74.42% is the change from 645 to 165
Calculation steps:
[( 165 - 645 ) ÷ 645] x 100 = -74.42%
Formula
Percentage change = [(165 - 645) / 645] x 100
Subtract the new number by the original number
165 - 645 = -480
-480 ÷ 645 = -0.7441860465116279
-0.7441860465116279 x 100 = -74.42%