-17.4% is the change from 799 to 660
Calculation steps:
[( 660 - 799 ) ÷ 799] x 100 = -17.4%
Formula
Percentage change = [(660 - 799) / 799] x 100
Subtract the new number by the original number
660 - 799 = -139
-139 ÷ 799 = -0.1739674593241552
-0.1739674593241552 x 100 = -17.4%