Cost of Living Index – how to calculate increase

13.3.1.L1 Updated on:

What is the Cost of Living Index

Jersey’s Cost of Living Index is also known as the Retail Price Index. It is not strictly a cost of living index as the items used to identify changes in prices in the island cover a wide area, but are not necessarily items that would be essential to living. Prices of 2,500 goods and services are monitored quarterly staff employed by Statistics Jersey.

The price changes are expressed as percentage increases or decreases relative to June 2000 when the Index was given a value of 100.

RPI Calculator

The latest RPI Report and an RPI Calculator can be found on the Government of Jersey Retail Price Index page

A manual calculation can be performed using the table below.

To find an increase over a period when there has been a base change within the period being calculated – this example takes into account the resetting of base and has been calculated over a five year period.

Example for September 1997 – September 2002

Take base for the end of a period and multiply by 1.716
Subtract the base from the beginning of a period
109.7 x 1.716 = 188.25
153.80
34.45
Calculate
Therefore percentage increase over the period (5 years)
34.45 x 100
153.8= 22.40%

To find an increase over a period when the base has not been reset within the period – this example is after the base was reset in June 2000 so ignores the old base, it is over a period of three years.

Example for September 2000 to September 2003

Take base from the end of the period
Subtract the base from the beginning of the period
113.9
– 101.1
= 12.8
Calculate
Divided by the base from the beginning of the period, therefore, percentage increase over the period (3 years)
12.8 x 100
101.1= 12.66%

The percentage increase can be calculated over any period using the two formulas above, just check to see if there has been a base change within the period being calculated and use the appropriate formula.

Cost of Living by Quarter since 2000

QUARTER DATE CURRENT BASE ANNUAL INCREASE INCREASE OVER 3 YEARS
6/2000 Old base – 171.6
New base – 100.0
4.4 12.97
9/2000 101.1 4.6 12.8
12/2000 101.6 4.0 12.85
3/2001 103.0 4.0 12.43
6/2001 103.9 3.9 12.13
9/2001 105.3 4.2 12.65
12/2001 104.7 3.1 11.80
3/2002 107.1 4.0 13.10
6/2002 108.3 4.2 13.11
9/2002 109.7 4.2 13.53
12/2002 109.8 4.9 12.35
3/2003 112.4 4.9 13.52
6/2003 112.9 4.2 12.90
9/2003 113.9 3.8 12.66
12/2003 114.2 4.0 12.40
3/2004 116.6 3.7 13.20
6/2004 118.3 4.8 13.86
9/2004 120.3 5.6 14.24
12/2004 120.3 5.3 14.90
3/2005 121.9 4.5 13.82
6/2005 122.6 3.6 13.20
9/2005 122.7 2.0 11.9
12/2005 123.0 2.2 12
3/2006 124.8 2.4 11
6/2006 126.2 2.9 11.8
9/2006 127.1 3.6 11.6
12/2006 127.5 3.7 11.6
3/2007 130.3 4.4 11.75
6/2007 131.6 4.3 11.24
9/2007 132.1 3.9 11.67
12/2007 133.3 4.5 10.80
3/2008 134.5 3.2 10.33
6/2008 139.0 5.6 13.37
9/2008 140.5 6.4 14.50
12/2008 137.7 3.3 11.95
3/2009 137.3 2.1 10.02
6/2009 138.5 -0.4 8.88
9/2009 139.6 -0.6 9.83
12/2009 140.0 1.7 9.80
3/2010 141.7 3.2 8.75
6/2010 142.4 2.8 8.21
9/2010 142.6 2.1 7.95
12/2010 143.2 2.3 7.43
03/2011 146.1 3.1 8.62
06/2011 148.8 4.5 7.05
09/2011 150.3 5.4 6.97
12/2011 150.4 5.0 9.22
03/2012 153.0 4.7 11.43
06/2012 153.3 3.0 10.69
09/2012 154.5 2.8 10.67
12/2012 153.5 2.1 9.64
03/2013 155.2 1.4 9.53
06/2013 155.6 1.5 9.27
09/2013 156.4 1.2 9.68
12/2013 156.4 1.9 9.21
03/2014 157.9 1.7 8.07
06/2014 158.1 1.6 6.25
09/2014 159.3 1.9 5.99
12/2014 158.5 1.3 5.38
03/2015 158.9 0.6 3.85
06/2015 159.6 0.9 4.10
09/2015 159.5 0.1 3.24
12/2015 160.0 0.9 4.23
03/2016 161.2 1.4 3.86
06/2016 162.0 1.5 4.11
09/2016 162.7 2.0 4.02
12/2016 163.0 1.9 4.21
03/2017 165.9 2.9 5.07
06/2017 166.1 2.5 5.06
09/2017 167.8 3.1 5.87
12/2017 168.8 3.6 6.49
03/2018 171.2 3.2 7.74
06/2018 173.5 4.5 8.70
09/2018 174.2 4.3 9.70
12/2018 175.4 3.9 5.75
03/2019 177.3 3.6 5.88
06/2019 178.4 2.8 6.05
09/2019 179.7 2.7 6.21
12/2019 179.8 2.5 6.39
03/2020 182.1 2.7 6.58
06/2020 179.3 0.5 6.70
09/2020 181.4 0.9 6.84
12/2020 181.4 0.9 6.92
03/2021 184.1 0.8 6.28
06/2021 185.5 3.5 6.31
09/2021 186.7 2.9 6.63
12/2021 188.3 3.8 6.38
03/2022 194.6 6.0 6.43

The next increase will be published on 22nd July 2022.