-99.35% is the change from 309 to 2
Calculation steps:
[( 2 - 309 ) ÷ 309] x 100 = -99.35%
Formula
Percentage change = [(2 - 309) / 309] x 100
Subtract the new number by the original number
2 - 309 = -307
-307 ÷ 309 = -0.9935275080906149
-0.9935275080906149 x 100 = -99.35%