-88.7% is the change from 646 to 73
Calculation steps:
[( 73 - 646 ) ÷ 646] x 100 = -88.7%
Formula
Percentage change = [(73 - 646) / 646] x 100
Subtract the new number by the original number
73 - 646 = -573
-573 ÷ 646 = -0.8869969040247678
-0.8869969040247678 x 100 = -88.7%