-31.26% is the change from 966 to 664
Calculation steps:
[( 664 - 966 ) ÷ 966] x 100 = -31.26%
Formula
Percentage change = [(664 - 966) / 966] x 100
Subtract the new number by the original number
664 - 966 = -302
-302 ÷ 966 = -0.31262939958592134
-0.31262939958592134 x 100 = -31.26%