-66.02% is the change from 615 to 209
Calculation steps:
[( 209 - 615 ) ÷ 615] x 100 = -66.02%
Formula
Percentage change = [(209 - 615) / 615] x 100
Subtract the new number by the original number
209 - 615 = -406
-406 ÷ 615 = -0.6601626016260163
-0.6601626016260163 x 100 = -66.02%