-0.37% is the change from 271 to 270
Calculation steps:
[( 270 - 271 ) ÷ 271] x 100 = -0.37%
Formula
Percentage change = [(270 - 271) / 271] x 100
Subtract the new number by the original number
270 - 271 = -1
-1 ÷ 271 = -0.0036900369003690036
-0.0036900369003690036 x 100 = -0.37%