-33.23% is the change from 966 to 645
Calculation steps:
[( 645 - 966 ) ÷ 966] x 100 = -33.23%
Formula
Percentage change = [(645 - 966) / 966] x 100
Subtract the new number by the original number
645 - 966 = -321
-321 ÷ 966 = -0.33229813664596275
-0.33229813664596275 x 100 = -33.23%