-19.98% is the change from 836 to 669
Calculation steps:
[( 669 - 836 ) ÷ 836] x 100 = -19.98%
Formula
Percentage change = [(669 - 836) / 836] x 100
Subtract the new number by the original number
669 - 836 = -167
-167 ÷ 836 = -0.19976076555023922
-0.19976076555023922 x 100 = -19.98%