-94.51% is the change from 273 to 15
Calculation steps:
[( 15 - 273 ) ÷ 273] x 100 = -94.51%
Formula
Percentage change = [(15 - 273) / 273] x 100
Subtract the new number by the original number
15 - 273 = -258
-258 ÷ 273 = -0.945054945054945
-0.945054945054945 x 100 = -94.51%