-39.81% is the change from 309 to 186
Calculation steps:
[( 186 - 309 ) ÷ 309] x 100 = -39.81%
Formula
Percentage change = [(186 - 309) / 309] x 100
Subtract the new number by the original number
186 - 309 = -123
-123 ÷ 309 = -0.39805825242718446
-0.39805825242718446 x 100 = -39.81%