-97.75% is the change from 311 to 7
Calculation steps:
[( 7 - 311 ) ÷ 311] x 100 = -97.75%
Formula
Percentage change = [(7 - 311) / 311] x 100
Subtract the new number by the original number
7 - 311 = -304
-304 ÷ 311 = -0.977491961414791
-0.977491961414791 x 100 = -97.75%