-6.3% is the change from 270 to 253
Calculation steps:
[( 253 - 270 ) ÷ 270] x 100 = -6.3%
Formula
Percentage change = [(253 - 270) / 270] x 100
Subtract the new number by the original number
253 - 270 = -17
-17 ÷ 270 = -0.06296296296296296
-0.06296296296296296 x 100 = -6.3%