The table below displays the Consumer Price Index (CPI) for an economy over a three-year period.
| Year | Consumer Price Index (CPI) |
|---|---|
| Year 1 | 115.2 |
| Year 2 | 122.5 |
| Year 3 | 128.8 |
What is the annual rate of inflation in Year 3 (to 1 decimal place)?
4.9%4.9\%4.9%
5.1%5.1\%5.1%
5.5%5.5\%5.5%
6.3%6.3\%6.3%
