-0.16% is the change from 611 to 610
Calculation steps:
[( 610 - 611 ) ÷ 611] x 100 = -0.16%
Formula
Percentage change = [(610 - 611) / 611] x 100
Subtract the new number by the original number
610 - 611 = -1
-1 ÷ 611 = -0.0016366612111292963
-0.0016366612111292963 x 100 = -0.16%