-0.33% is the change from 611 to 609
Calculation steps:
[( 609 - 611 ) ÷ 611] x 100 = -0.33%
Formula
Percentage change = [(609 - 611) / 611] x 100
Subtract the new number by the original number
609 - 611 = -2
-2 ÷ 611 = -0.0032733224222585926
-0.0032733224222585926 x 100 = -0.33%