-34.07% is the change from 810 to 534
Calculation steps:
[( 534 - 810 ) ÷ 810] x 100 = -34.07%
Formula
Percentage change = [(534 - 810) / 810] x 100
Subtract the new number by the original number
534 - 810 = -276
-276 ÷ 810 = -0.34074074074074073
-0.34074074074074073 x 100 = -34.07%