-19.54% is the change from 819 to 659
Calculation steps:
[( 659 - 819 ) ÷ 819] x 100 = -19.54%
Formula
Percentage change = [(659 - 819) / 819] x 100
Subtract the new number by the original number
659 - 819 = -160
-160 ÷ 819 = -0.19536019536019536
-0.19536019536019536 x 100 = -19.54%