-34.06% is the change from 966 to 637
Calculation steps:
[( 637 - 966 ) ÷ 966] x 100 = -34.06%
Formula
Percentage change = [(637 - 966) / 966] x 100
Subtract the new number by the original number
637 - 966 = -329
-329 ÷ 966 = -0.34057971014492755
-0.34057971014492755 x 100 = -34.06%