-32.22% is the change from 509 to 345
Calculation steps:
[( 345 - 509 ) ÷ 509] x 100 = -32.22%
Formula
Percentage change = [(345 - 509) / 509] x 100
Subtract the new number by the original number
345 - 509 = -164
-164 ÷ 509 = -0.32220039292730845
-0.32220039292730845 x 100 = -32.22%