-64.19% is the change from 645 to 231
Calculation steps:
[( 231 - 645 ) ÷ 645] x 100 = -64.19%
Formula
Percentage change = [(231 - 645) / 645] x 100
Subtract the new number by the original number
231 - 645 = -414
-414 ÷ 645 = -0.641860465116279
-0.641860465116279 x 100 = -64.19%