-28.03% is the change from 917 to 660
Calculation steps:
[( 660 - 917 ) ÷ 917] x 100 = -28.03%
Formula
Percentage change = [(660 - 917) / 917] x 100
Subtract the new number by the original number
660 - 917 = -257
-257 ÷ 917 = -0.2802617230098146
-0.2802617230098146 x 100 = -28.03%