-30.97% is the change from 620 to 428
Calculation steps:
[( 428 - 620 ) ÷ 620] x 100 = -30.97%
Formula
Percentage change = [(428 - 620) / 620] x 100
Subtract the new number by the original number
428 - 620 = -192
-192 ÷ 620 = -0.3096774193548387
-0.3096774193548387 x 100 = -30.97%