-99.37% is the change from 315 to 2
Calculation steps:
[( 2 - 315 ) ÷ 315] x 100 = -99.37%
Formula
Percentage change = [(2 - 315) / 315] x 100
Subtract the new number by the original number
2 - 315 = -313
-313 ÷ 315 = -0.9936507936507937
-0.9936507936507937 x 100 = -99.37%