-37.6% is the change from 835 to 521
Calculation steps:
[( 521 - 835 ) ÷ 835] x 100 = -37.6%
Formula
Percentage change = [(521 - 835) / 835] x 100
Subtract the new number by the original number
521 - 835 = -314
-314 ÷ 835 = -0.37604790419161677
-0.37604790419161677 x 100 = -37.6%