-42.72% is the change from 309 to 177
Calculation steps:
[( 177 - 309 ) ÷ 309] x 100 = -42.72%
Formula
Percentage change = [(177 - 309) / 309] x 100
Subtract the new number by the original number
177 - 309 = -132
-132 ÷ 309 = -0.42718446601941745
-0.42718446601941745 x 100 = -42.72%