-65.04% is the change from 615 to 215
Calculation steps:
[( 215 - 615 ) ÷ 615] x 100 = -65.04%
Formula
Percentage change = [(215 - 615) / 615] x 100
Subtract the new number by the original number
215 - 615 = -400
-400 ÷ 615 = -0.6504065040650406
-0.6504065040650406 x 100 = -65.04%