-19.84% is the change from 620 to 497
Calculation steps:
[( 497 - 620 ) ÷ 620] x 100 = -19.84%
Formula
Percentage change = [(497 - 620) / 620] x 100
Subtract the new number by the original number
497 - 620 = -123
-123 ÷ 620 = -0.19838709677419356
-0.19838709677419356 x 100 = -19.84%