-32.71% is the change from 645 to 434
Calculation steps:
[( 434 - 645 ) ÷ 645] x 100 = -32.71%
Formula
Percentage change = [(434 - 645) / 645] x 100
Subtract the new number by the original number
434 - 645 = -211
-211 ÷ 645 = -0.3271317829457364
-0.3271317829457364 x 100 = -32.71%