-19.64% is the change from 611 to 491
Calculation steps:
[( 491 - 611 ) ÷ 611] x 100 = -19.64%
Formula
Percentage change = [(491 - 611) / 611] x 100
Subtract the new number by the original number
491 - 611 = -120
-120 ÷ 611 = -0.19639934533551553
-0.19639934533551553 x 100 = -19.64%