-70.3% is the change from 670 to 199
Calculation steps:
[( 199 - 670 ) ÷ 670] x 100 = -70.3%
Formula
Percentage change = [(199 - 670) / 670] x 100
Subtract the new number by the original number
199 - 670 = -471
-471 ÷ 670 = -0.7029850746268657
-0.7029850746268657 x 100 = -70.3%