-99.4% is the change from 168 to 1
Calculation steps:
[( 1 - 168 ) ÷ 168] x 100 = -99.4%
Formula
Percentage change = [(1 - 168) / 168] x 100
Subtract the new number by the original number
1 - 168 = -167
-167 ÷ 168 = -0.9940476190476191
-0.9940476190476191 x 100 = -99.4%