-55.7% is the change from 307 to 136
Calculation steps:
[( 136 - 307 ) ÷ 307] x 100 = -55.7%
Formula
Percentage change = [(136 - 307) / 307] x 100
Subtract the new number by the original number
136 - 307 = -171
-171 ÷ 307 = -0.5570032573289903
-0.5570032573289903 x 100 = -55.7%