-37.83% is the change from 830 to 516
Calculation steps:
[( 516 - 830 ) ÷ 830] x 100 = -37.83%
Formula
Percentage change = [(516 - 830) / 830] x 100
Subtract the new number by the original number
516 - 830 = -314
-314 ÷ 830 = -0.3783132530120482
-0.3783132530120482 x 100 = -37.83%