-62.36% is the change from 813 to 306
Calculation steps:
[( 306 - 813 ) ÷ 813] x 100 = -62.36%
Formula
Percentage change = [(306 - 813) / 813] x 100
Subtract the new number by the original number
306 - 813 = -507
-507 ÷ 813 = -0.6236162361623616
-0.6236162361623616 x 100 = -62.36%