-31.19% is the change from 917 to 631
Calculation steps:
[( 631 - 917 ) ÷ 917] x 100 = -31.19%
Formula
Percentage change = [(631 - 917) / 917] x 100
Subtract the new number by the original number
631 - 917 = -286
-286 ÷ 917 = -0.311886586695747
-0.311886586695747 x 100 = -31.19%