-99.9% is the change from 972 to 1
Calculation steps:
[( 1 - 972 ) ÷ 972] x 100 = -99.9%
Formula
Percentage change = [(1 - 972) / 972] x 100
Subtract the new number by the original number
1 - 972 = -971
-971 ÷ 972 = -0.9989711934156379
-0.9989711934156379 x 100 = -99.9%