-19.59% is the change from 827 to 665
Calculation steps:
[( 665 - 827 ) ÷ 827] x 100 = -19.59%
Formula
Percentage change = [(665 - 827) / 827] x 100
Subtract the new number by the original number
665 - 827 = -162
-162 ÷ 827 = -0.19588875453446192
-0.19588875453446192 x 100 = -19.59%