-18.01% is the change from 816 to 669
Calculation steps:
[( 669 - 816 ) ÷ 816] x 100 = -18.01%
Formula
Percentage change = [(669 - 816) / 816] x 100
Subtract the new number by the original number
669 - 816 = -147
-147 ÷ 816 = -0.1801470588235294
-0.1801470588235294 x 100 = -18.01%