-73.5% is the change from 966 to 256
Calculation steps:
[( 256 - 966 ) ÷ 966] x 100 = -73.5%
Formula
Percentage change = [(256 - 966) / 966] x 100
Subtract the new number by the original number
256 - 966 = -710
-710 ÷ 966 = -0.7349896480331263
-0.7349896480331263 x 100 = -73.5%