-50.72% is the change from 623 to 307
Calculation steps:
[( 307 - 623 ) ÷ 623] x 100 = -50.72%
Formula
Percentage change = [(307 - 623) / 623] x 100
Subtract the new number by the original number
307 - 623 = -316
-316 ÷ 623 = -0.507223113964687
-0.507223113964687 x 100 = -50.72%