-1.61% is the change from 620 to 610
Calculation steps:
[( 610 - 620 ) ÷ 620] x 100 = -1.61%
Formula
Percentage change = [(610 - 620) / 620] x 100
Subtract the new number by the original number
610 - 620 = -10
-10 ÷ 620 = -0.016129032258064516
-0.016129032258064516 x 100 = -1.61%