31.87% is the change from 615 to 811
Calculation steps:
[( 811 - 615 ) ÷ 615] x 100 = 31.87%
Formula
Percentage change = [(811 - 615) / 615] x 100
Subtract the new number by the original number
811 - 615 = 196
196 ÷ 615 = 0.31869918699186994
0.31869918699186994 x 100 = 31.87%