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<p>Rail, Bus and Coach and Motoring</p><p>The real terms changes in percentage costs
for years 1997, 2010 and 2015 were calculated using the components of Retail Price
Index (RPI) from the ‘RPI All Items Index 1987=100’ available from the Office for
National Statistics:</p><p><a href="https://www.ons.gov.uk/economy/inflationandpriceindices/timeseries/chaw/mm23"
target="_blank">https://www.ons.gov.uk/economy/inflationandpriceindices/timeseries/chaw/mm23</a></p><p>
</p><p>These figures are based on the following component categories:</p><p>CHAW-
RPI All Items; DOCW-Rail Fares; DOCX- Bus and Coach Fares; CHBK- Motoring</p><p> </p><p>These
component categories have been annualised and re-based to 1997, 2010 and 2015 for
comparison to 2016. The RPI All Items index was used to calculate the real terms increases
for each transport component.</p><p> </p><p>Transport cost increases from 1980 use
historic ONS RPI data. This is due to RPI being re-based in 1987. Pre-1987 codes for
transport components were matched to the new categories using the code descriptors,
which had remained unchanged. The historic data is not published online. The real
terms increase from 1980 was then calculated using the same methodology as above.</p><p>
</p><p>While information prior to 1987 was provided in previous PQ responses, it was
drawn from historical data which is not readily available and will no longer be provided
in future.</p><p><strong> </strong></p><p>Aviation</p><p>The costs of travelling domestically
by air are based on fare data taken from the Civil Aviation Authority passenger survey.
The Retail Price Index (RPI), taken from the Office for National Statistics, has been
used to adjust for the real term change in the costs. As no separate RPI index is
available for domestic air fares, the overall index for transport components has been
used.</p><p> </p><p>This index is available from Table TSGB1308 in the Transport Statistics
Great Britain Compendium at the link below:</p><p><a href="https://www.gov.uk/government/statistical-data-sets/transport-expenditure-tsgb13"
target="_blank">https://www.gov.uk/government/statistical-data-sets/transport-expenditure-tsgb13</a></p><p>
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