-18.54% is the change from 615 to 501
Calculation steps:
[( 501 - 615 ) ÷ 615] x 100 = -18.54%
Formula
Percentage change = [(501 - 615) / 615] x 100
Subtract the new number by the original number
501 - 615 = -114
-114 ÷ 615 = -0.18536585365853658
-0.18536585365853658 x 100 = -18.54%