-64.72% is the change from 615 to 217
Calculation steps:
[( 217 - 615 ) ÷ 615] x 100 = -64.72%
Formula
Percentage change = [(217 - 615) / 615] x 100
Subtract the new number by the original number
217 - 615 = -398
-398 ÷ 615 = -0.6471544715447154
-0.6471544715447154 x 100 = -64.72%