-1.61% is the change from 621 to 611
Calculation steps:
[( 611 - 621 ) ÷ 621] x 100 = -1.61%
Formula
Percentage change = [(611 - 621) / 621] x 100
Subtract the new number by the original number
611 - 621 = -10
-10 ÷ 621 = -0.01610305958132045
-0.01610305958132045 x 100 = -1.61%