There are discontinuities between March and April 2013, and between September and October 2018, due to changes in the survey method. Source: Cabinet Office, "Consumer Confidence Survey."
Chart 6  Consumer Prices Measures of Underlying Inflation  Consumer Price Index 2.0  y/y % chg.  y/y % chg.  % points  1.0  50  1.5 1.0  0.5  0.5 0.0  0.0  0  -0.5 -1.0  -0.5  Trimmed mean  CPI (all items less fresh food) -1.5  Weighted median  CPI (all items less fresh food and energy)  Diffusion index (right scale)  -2.0  -1.0  11 CY 201112 12 13 13 14 14  15 15 16 16 17 17 18 18  Note: Figures are adjusted for changes in the consumption tax rate.