-17.42% is the change from 620 to 512
Calculation steps:
[( 512 - 620 ) ÷ 620] x 100 = -17.42%
Formula
Percentage change = [(512 - 620) / 620] x 100
Subtract the new number by the original number
512 - 620 = -108
-108 ÷ 620 = -0.17419354838709677
-0.17419354838709677 x 100 = -17.42%