-99.68% is the change from 310 to 1
Calculation steps:
[( 1 - 310 ) ÷ 310] x 100 = -99.68%
Formula
Percentage change = [(1 - 310) / 310] x 100
Subtract the new number by the original number
1 - 310 = -309
-309 ÷ 310 = -0.9967741935483871
-0.9967741935483871 x 100 = -99.68%