Extract A: UK Inflation (%) as measured by the Consumer Prices Index (CPI) and the Consumer Prices Index including owner occupiers' housing costs (CPIH), 2015–2022
| Year | CPI (%) | CPIH (%) |
|---|---|---|
| 2015 | 0.0 | 0.4 |
| 2016 | 0.7 | 1.0 |
| 2017 | 2.7 | 2.6 |
| 2018 | 2.5 | 2.3 |
| 2019 | 1.8 | 1.7 |
| 2020 | 1.0 | 1.0 |
| 2021 | 2.6 | 2.5 |
| 2022 | 9.1 | 7.9 |
Using Extract A, calculate the difference between the annual average value of CPI and the annual average value of CPIH for the years 2017 to 2020, and identify one other significant comparison between the CPI and the CPIH for the period 2015 to 2022.