-99.67% is the change from 306 to 1
Calculation steps:
[( 1 - 306 ) ÷ 306] x 100 = -99.67%
Formula
Percentage change = [(1 - 306) / 306] x 100
Subtract the new number by the original number
1 - 306 = -305
-305 ÷ 306 = -0.9967320261437909
-0.9967320261437909 x 100 = -99.67%