-55.66% is the change from 309 to 137
Calculation steps:
[( 137 - 309 ) ÷ 309] x 100 = -55.66%
Formula
Percentage change = [(137 - 309) / 309] x 100
Subtract the new number by the original number
137 - 309 = -172
-172 ÷ 309 = -0.5566343042071198
-0.5566343042071198 x 100 = -55.66%