-19.9% is the change from 804 to 644
Calculation steps:
[( 644 - 804 ) ÷ 804] x 100 = -19.9%
Formula
Percentage change = [(644 - 804) / 804] x 100
Subtract the new number by the original number
644 - 804 = -160
-160 ÷ 804 = -0.19900497512437812
-0.19900497512437812 x 100 = -19.9%