-34.73% is the change from 645 to 421
Calculation steps:
[( 421 - 645 ) ÷ 645] x 100 = -34.73%
Formula
Percentage change = [(421 - 645) / 645] x 100
Subtract the new number by the original number
421 - 645 = -224
-224 ÷ 645 = -0.34728682170542635
-0.34728682170542635 x 100 = -34.73%