-99.85% is the change from 648 to 1
Calculation steps:
[( 1 - 648 ) ÷ 648] x 100 = -99.85%
Formula
Percentage change = [(1 - 648) / 648] x 100
Subtract the new number by the original number
1 - 648 = -647
-647 ÷ 648 = -0.9984567901234568
-0.9984567901234568 x 100 = -99.85%