-35.6% is the change from 309 to 199
Calculation steps:
[( 199 - 309 ) ÷ 309] x 100 = -35.6%
Formula
Percentage change = [(199 - 309) / 309] x 100
Subtract the new number by the original number
199 - 309 = -110
-110 ÷ 309 = -0.3559870550161812
-0.3559870550161812 x 100 = -35.6%