-95.18% is the change from 311 to 15
Calculation steps:
[( 15 - 311 ) ÷ 311] x 100 = -95.18%
Formula
Percentage change = [(15 - 311) / 311] x 100
Subtract the new number by the original number
15 - 311 = -296
-296 ÷ 311 = -0.9517684887459807
-0.9517684887459807 x 100 = -95.18%