-33.64% is the change from 966 to 641
Calculation steps:
[( 641 - 966 ) ÷ 966] x 100 = -33.64%
Formula
Percentage change = [(641 - 966) / 966] x 100
Subtract the new number by the original number
641 - 966 = -325
-325 ÷ 966 = -0.3364389233954451
-0.3364389233954451 x 100 = -33.64%