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The following table shows data on the Consumer Price Index over the past few years.
| Year | CPI |
| 2012 | 95 |
| 2013 | 97 |
| 2014 | 98 |
| 2015 | 100 |
| 2016 | 102.5 |
| 2017 | 104 |
Based on this data, what is the base year used in the CPI calculations?