-66.38% is the change from 815 to 274
Calculation steps:
[( 274 - 815 ) ÷ 815] x 100 = -66.38%
Formula
Percentage change = [(274 - 815) / 815] x 100
Subtract the new number by the original number
274 - 815 = -541
-541 ÷ 815 = -0.6638036809815951
-0.6638036809815951 x 100 = -66.38%