-62.22% is the change from 810 to 306
Calculation steps:
[( 306 - 810 ) ÷ 810] x 100 = -62.22%
Formula
Percentage change = [(306 - 810) / 810] x 100
Subtract the new number by the original number
306 - 810 = -504
-504 ÷ 810 = -0.6222222222222222
-0.6222222222222222 x 100 = -62.22%