-33.02% is the change from 966 to 647
Calculation steps:
[( 647 - 966 ) ÷ 966] x 100 = -33.02%
Formula
Percentage change = [(647 - 966) / 966] x 100
Subtract the new number by the original number
647 - 966 = -319
-319 ÷ 966 = -0.3302277432712215
-0.3302277432712215 x 100 = -33.02%