-19.73% is the change from 821 to 659
Calculation steps:
[( 659 - 821 ) ÷ 821] x 100 = -19.73%
Formula
Percentage change = [(659 - 821) / 821] x 100
Subtract the new number by the original number
659 - 821 = -162
-162 ÷ 821 = -0.19732034104750304
-0.19732034104750304 x 100 = -19.73%