-99.9% is the change from 966 to 1
Calculation steps:
[( 1 - 966 ) ÷ 966] x 100 = -99.9%
Formula
Percentage change = [(1 - 966) / 966] x 100
Subtract the new number by the original number
1 - 966 = -965
-965 ÷ 966 = -0.9989648033126294
-0.9989648033126294 x 100 = -99.9%