-34.05% is the change from 605 to 399
Calculation steps:
[( 399 - 605 ) ÷ 605] x 100 = -34.05%
Formula
Percentage change = [(399 - 605) / 605] x 100
Subtract the new number by the original number
399 - 605 = -206
-206 ÷ 605 = -0.34049586776859503
-0.34049586776859503 x 100 = -34.05%