-20.74% is the change from 839 to 665
Calculation steps:
[( 665 - 839 ) ÷ 839] x 100 = -20.74%
Formula
Percentage change = [(665 - 839) / 839] x 100
Subtract the new number by the original number
665 - 839 = -174
-174 ÷ 839 = -0.20738974970202623
-0.20738974970202623 x 100 = -20.74%