-86.61% is the change from 620 to 83
Calculation steps:
[( 83 - 620 ) ÷ 620] x 100 = -86.61%
Formula
Percentage change = [(83 - 620) / 620] x 100
Subtract the new number by the original number
83 - 620 = -537
-537 ÷ 620 = -0.8661290322580645
-0.8661290322580645 x 100 = -86.61%