-60.9% is the change from 509 to 199
Calculation steps:
[( 199 - 509 ) ÷ 509] x 100 = -60.9%
Formula
Percentage change = [(199 - 509) / 509] x 100
Subtract the new number by the original number
199 - 509 = -310
-310 ÷ 509 = -0.6090373280943026
-0.6090373280943026 x 100 = -60.9%