-99.63% is the change from 273 to 1
Calculation steps:
[( 1 - 273 ) ÷ 273] x 100 = -99.63%
Formula
Percentage change = [(1 - 273) / 273] x 100
Subtract the new number by the original number
1 - 273 = -272
-272 ÷ 273 = -0.9963369963369964
-0.9963369963369964 x 100 = -99.63%