-30.53% is the change from 917 to 637
Calculation steps:
[( 637 - 917 ) ÷ 917] x 100 = -30.53%
Formula
Percentage change = [(637 - 917) / 917] x 100
Subtract the new number by the original number
637 - 917 = -280
-280 ÷ 917 = -0.3053435114503817
-0.3053435114503817 x 100 = -30.53%