-99.4% is the change from 331 to 2
Calculation steps:
[( 2 - 331 ) ÷ 331] x 100 = -99.4%
Formula
Percentage change = [(2 - 331) / 331] x 100
Subtract the new number by the original number
2 - 331 = -329
-329 ÷ 331 = -0.9939577039274925
-0.9939577039274925 x 100 = -99.4%