-33.99% is the change from 971 to 641
Calculation steps:
[( 641 - 971 ) ÷ 971] x 100 = -33.99%
Formula
Percentage change = [(641 - 971) / 971] x 100
Subtract the new number by the original number
641 - 971 = -330
-330 ÷ 971 = -0.33985581874356335
-0.33985581874356335 x 100 = -33.99%