-62.06% is the change from 817 to 310
Calculation steps:
[( 310 - 817 ) ÷ 817] x 100 = -62.06%
Formula
Percentage change = [(310 - 817) / 817] x 100
Subtract the new number by the original number
310 - 817 = -507
-507 ÷ 817 = -0.620563035495716
-0.620563035495716 x 100 = -62.06%