-30.54% is the change from 956 to 664
Calculation steps:
[( 664 - 956 ) ÷ 956] x 100 = -30.54%
Formula
Percentage change = [(664 - 956) / 956] x 100
Subtract the new number by the original number
664 - 956 = -292
-292 ÷ 956 = -0.3054393305439331
-0.3054393305439331 x 100 = -30.54%