-18.12% is the change from 817 to 669
Calculation steps:
[( 669 - 817 ) ÷ 817] x 100 = -18.12%
Formula
Percentage change = [(669 - 817) / 817] x 100
Subtract the new number by the original number
669 - 817 = -148
-148 ÷ 817 = -0.18115055079559364
-0.18115055079559364 x 100 = -18.12%