-96.29% is the change from 620 to 23
Calculation steps:
[( 23 - 620 ) ÷ 620] x 100 = -96.29%
Formula
Percentage change = [(23 - 620) / 620] x 100
Subtract the new number by the original number
23 - 620 = -597
-597 ÷ 620 = -0.9629032258064516
-0.9629032258064516 x 100 = -96.29%