-62.25% is the change from 816 to 308
Calculation steps:
[( 308 - 816 ) ÷ 816] x 100 = -62.25%
Formula
Percentage change = [(308 - 816) / 816] x 100
Subtract the new number by the original number
308 - 816 = -508
-508 ÷ 816 = -0.6225490196078431
-0.6225490196078431 x 100 = -62.25%