-33.64% is the change from 972 to 645
Calculation steps:
[( 645 - 972 ) ÷ 972] x 100 = -33.64%
Formula
Percentage change = [(645 - 972) / 972] x 100
Subtract the new number by the original number
645 - 972 = -327
-327 ÷ 972 = -0.33641975308641975
-0.33641975308641975 x 100 = -33.64%