-32.64% is the change from 959 to 646
Calculation steps:
[( 646 - 959 ) ÷ 959] x 100 = -32.64%
Formula
Percentage change = [(646 - 959) / 959] x 100
Subtract the new number by the original number
646 - 959 = -313
-313 ÷ 959 = -0.32638164754953075
-0.32638164754953075 x 100 = -32.64%