-30.1% is the change from 917 to 641
Calculation steps:
[( 641 - 917 ) ÷ 917] x 100 = -30.1%
Formula
Percentage change = [(641 - 917) / 917] x 100
Subtract the new number by the original number
641 - 917 = -276
-276 ÷ 917 = -0.3009814612868048
-0.3009814612868048 x 100 = -30.1%