-17.08% is the change from 808 to 670
Calculation steps:
[( 670 - 808 ) ÷ 808] x 100 = -17.08%
Formula
Percentage change = [(670 - 808) / 808] x 100
Subtract the new number by the original number
670 - 808 = -138
-138 ÷ 808 = -0.1707920792079208
-0.1707920792079208 x 100 = -17.08%