-99.9% is the change from 975 to 1
Calculation steps:
[( 1 - 975 ) ÷ 975] x 100 = -99.9%
Formula
Percentage change = [(1 - 975) / 975] x 100
Subtract the new number by the original number
1 - 975 = -974
-974 ÷ 975 = -0.9989743589743589
-0.9989743589743589 x 100 = -99.9%