-99.68% is the change from 620 to 2
Calculation steps:
[( 2 - 620 ) ÷ 620] x 100 = -99.68%
Formula
Percentage change = [(2 - 620) / 620] x 100
Subtract the new number by the original number
2 - 620 = -618
-618 ÷ 620 = -0.9967741935483871
-0.9967741935483871 x 100 = -99.68%