-45.43% is the change from 623 to 340
Calculation steps:
[( 340 - 623 ) ÷ 623] x 100 = -45.43%
Formula
Percentage change = [(340 - 623) / 623] x 100
Subtract the new number by the original number
340 - 623 = -283
-283 ÷ 623 = -0.45425361155698235
-0.45425361155698235 x 100 = -45.43%