-29.44% is the change from 917 to 647
Calculation steps:
[( 647 - 917 ) ÷ 917] x 100 = -29.44%
Formula
Percentage change = [(647 - 917) / 917] x 100
Subtract the new number by the original number
647 - 917 = -270
-270 ÷ 917 = -0.29443838604143946
-0.29443838604143946 x 100 = -29.44%