-32.39% is the change from 957 to 647
Calculation steps:
[( 647 - 957 ) ÷ 957] x 100 = -32.39%
Formula
Percentage change = [(647 - 957) / 957] x 100
Subtract the new number by the original number
647 - 957 = -310
-310 ÷ 957 = -0.3239289446185998
-0.3239289446185998 x 100 = -32.39%