-33.98% is the change from 615 to 406
Calculation steps:
[( 406 - 615 ) ÷ 615] x 100 = -33.98%
Formula
Percentage change = [(406 - 615) / 615] x 100
Subtract the new number by the original number
406 - 615 = -209
-209 ÷ 615 = -0.33983739837398375
-0.33983739837398375 x 100 = -33.98%