-66.17% is the change from 810 to 274
Calculation steps:
[( 274 - 810 ) ÷ 810] x 100 = -66.17%
Formula
Percentage change = [(274 - 810) / 810] x 100
Subtract the new number by the original number
274 - 810 = -536
-536 ÷ 810 = -0.6617283950617284
-0.6617283950617284 x 100 = -66.17%