-31.43% is the change from 509 to 349
Calculation steps:
[( 349 - 509 ) ÷ 509] x 100 = -31.43%
Formula
Percentage change = [(349 - 509) / 509] x 100
Subtract the new number by the original number
349 - 509 = -160
-160 ÷ 509 = -0.3143418467583497
-0.3143418467583497 x 100 = -31.43%