-16.09% is the change from 609 to 511
Calculation steps:
[( 511 - 609 ) ÷ 609] x 100 = -16.09%
Formula
Percentage change = [(511 - 609) / 609] x 100
Subtract the new number by the original number
511 - 609 = -98
-98 ÷ 609 = -0.16091954022988506
-0.16091954022988506 x 100 = -16.09%