-21.25% is the change from 273 to 215
Calculation steps:
[( 215 - 273 ) ÷ 273] x 100 = -21.25%
Formula
Percentage change = [(215 - 273) / 273] x 100
Subtract the new number by the original number
215 - 273 = -58
-58 ÷ 273 = -0.21245421245421245
-0.21245421245421245 x 100 = -21.25%