-18.64% is the change from 617 to 502
Calculation steps:
[( 502 - 617 ) ÷ 617] x 100 = -18.64%
Formula
Percentage change = [(502 - 617) / 617] x 100
Subtract the new number by the original number
502 - 617 = -115
-115 ÷ 617 = -0.18638573743922204
-0.18638573743922204 x 100 = -18.64%