-16.13% is the change from 620 to 520
Calculation steps:
[( 520 - 620 ) ÷ 620] x 100 = -16.13%
Formula
Percentage change = [(520 - 620) / 620] x 100
Subtract the new number by the original number
520 - 620 = -100
-100 ÷ 620 = -0.16129032258064516
-0.16129032258064516 x 100 = -16.13%