33.17% is the change from 612 to 815
Calculation steps:
[( 815 - 612 ) ÷ 612] x 100 = 33.17%
Formula
Percentage change = [(815 - 612) / 612] x 100
Subtract the new number by the original number
815 - 612 = 203
203 ÷ 612 = 0.33169934640522875
0.33169934640522875 x 100 = 33.17%