-99.9% is the change from 995 to 1
Calculation steps:
[( 1 - 995 ) ÷ 995] x 100 = -99.9%
Formula
Percentage change = [(1 - 995) / 995] x 100
Subtract the new number by the original number
1 - 995 = -994
-994 ÷ 995 = -0.9989949748743718
-0.9989949748743718 x 100 = -99.9%