-99.9% is the change from 973 to 1
Calculation steps:
[( 1 - 973 ) ÷ 973] x 100 = -99.9%
Formula
Percentage change = [(1 - 973) / 973] x 100
Subtract the new number by the original number
1 - 973 = -972
-972 ÷ 973 = -0.998972250770812
-0.998972250770812 x 100 = -99.9%