According to the U.S. Bureau of Labor Statistics, prices for intercity train fare were 10.03% higher in 2017 versus 2008 (a $2.01 difference in value).

**Between 2008 and 2017:** Intercity train fare experienced an average inflation rate of 1.07% per year.
In other words, intercity train fare costing $20 in the year 2008 would cost $22.01 in 2017 for an equivalent purchase.
Compared to the overall inflation rate of 1.45% during this same period, inflation for intercity train fare was
lower.

Raw Consumer Price Index data from U.S. Bureau of Labor Statistics for *Intercity train fare*:

Year |
2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |

CPI |
105.510 | 105.226 | 111.495 | 111.500 | 112.133 | 113.635 | 110.696 | 109.969 | 112.407 | 116.097 |

Below are calculations of equivalent buying power for Intercity train fare, over time, for $20 beginning in 2008. Each of the amounts below is equivalent in terms of what it could buy at the time:

Year | USD Value | Inflation Rate |
---|---|---|

2008 | $20.00 | - |

2009 | $19.95 | -0.27% |

2010 | $21.13 | 5.96% |

2011 | $21.14 | 0.00% |

2012 | $21.26 | 0.57% |

2013 | $21.54 | 1.34% |

2014 | $20.98 | -2.59% |

2015 | $20.85 | -0.66% |

2016 | $21.31 | 2.22% |

2017 | $22.01 | 3.28%* |

CPI in 2017 / CPI in 2008 * 2008 USD value = 2017 USD value

Then plug in historical CPI values from above. The CPI for Intercity train fare was 105.510 in the year 2008 and 116.097 in 2017:

116.097 / 105.510 * $20 =

Therefore, according to U.S. Bureau of Labor Statistics, $20 in 2008 has the same "purchasing power" as $22.01 in 2017 (in the CPI category of Intercity train fare).