-99.85% is the change from 665 to 1
Calculation steps:
[( 1 - 665 ) ÷ 665] x 100 = -99.85%
Formula
Percentage change = [(1 - 665) / 665] x 100
Subtract the new number by the original number
1 - 665 = -664
-664 ÷ 665 = -0.9984962406015038
-0.9984962406015038 x 100 = -99.85%