-15.31% is the change from 960 to 813
Calculation steps:
[( 813 - 960 ) ÷ 960] x 100 = -15.31%
Formula
Percentage change = [(813 - 960) / 960] x 100
Subtract the new number by the original number
813 - 960 = -147
-147 ÷ 960 = -0.153125
-0.153125 x 100 = -15.31%