-1.77% is the change from 620 to 609
Calculation steps:
[( 609 - 620 ) ÷ 620] x 100 = -1.77%
Formula
Percentage change = [(609 - 620) / 620] x 100
Subtract the new number by the original number
609 - 620 = -11
-11 ÷ 620 = -0.017741935483870968
-0.017741935483870968 x 100 = -1.77%