-61.4% is the change from 816 to 315
Calculation steps:
[( 315 - 816 ) ÷ 816] x 100 = -61.4%
Formula
Percentage change = [(315 - 816) / 816] x 100
Subtract the new number by the original number
315 - 816 = -501
-501 ÷ 816 = -0.6139705882352942
-0.6139705882352942 x 100 = -61.4%