-37.41% is the change from 810 to 507
Calculation steps:
[( 507 - 810 ) ÷ 810] x 100 = -37.41%
Formula
Percentage change = [(507 - 810) / 810] x 100
Subtract the new number by the original number
507 - 810 = -303
-303 ÷ 810 = -0.37407407407407406
-0.37407407407407406 x 100 = -37.41%