-61.87% is the change from 813 to 310
Calculation steps:
[( 310 - 813 ) ÷ 813] x 100 = -61.87%
Formula
Percentage change = [(310 - 813) / 813] x 100
Subtract the new number by the original number
310 - 813 = -503
-503 ÷ 813 = -0.6186961869618696
-0.6186961869618696 x 100 = -61.87%