-31.57% is the change from 966 to 661
Calculation steps:
[( 661 - 966 ) ÷ 966] x 100 = -31.57%
Formula
Percentage change = [(661 - 966) / 966] x 100
Subtract the new number by the original number
661 - 966 = -305
-305 ÷ 966 = -0.31573498964803315
-0.31573498964803315 x 100 = -31.57%