-99.85% is the change from 673 to 1
Calculation steps:
[( 1 - 673 ) ÷ 673] x 100 = -99.85%
Formula
Percentage change = [(1 - 673) / 673] x 100
Subtract the new number by the original number
1 - 673 = -672
-672 ÷ 673 = -0.9985141158989599
-0.9985141158989599 x 100 = -99.85%