-30.31% is the change from 947 to 660
Calculation steps:
[( 660 - 947 ) ÷ 947] x 100 = -30.31%
Formula
Percentage change = [(660 - 947) / 947] x 100
Subtract the new number by the original number
660 - 947 = -287
-287 ÷ 947 = -0.30306230200633577
-0.30306230200633577 x 100 = -30.31%