21.84% is the change from 815 to 993
Calculation steps:
[( 993 - 815 ) ÷ 815] x 100 = 21.84%
Formula
Percentage change = [(993 - 815) / 815] x 100
Subtract the new number by the original number
993 - 815 = 178
178 ÷ 815 = 0.2184049079754601
0.2184049079754601 x 100 = 21.84%