-16.37% is the change from 611 to 511
Calculation steps:
[( 511 - 611 ) ÷ 611] x 100 = -16.37%
Formula
Percentage change = [(511 - 611) / 611] x 100
Subtract the new number by the original number
511 - 611 = -100
-100 ÷ 611 = -0.16366612111292964
-0.16366612111292964 x 100 = -16.37%