-33.95% is the change from 972 to 642
Calculation steps:
[( 642 - 972 ) ÷ 972] x 100 = -33.95%
Formula
Percentage change = [(642 - 972) / 972] x 100
Subtract the new number by the original number
642 - 972 = -330
-330 ÷ 972 = -0.3395061728395062
-0.3395061728395062 x 100 = -33.95%