LOCAL INFORMATION
13.3.1.L1
Jersey Cost of Living Index (RPI) - Quarterly figures and how to calculate increases over period of time, e.g. 3 years
Extent: Jersey
Updated 13 April 2017
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The most recent increase is shown at the foot of the table
NOTE: The base was re-set to 100 in June 2000
You can use the excel calculator which can be accessed on on the gov.je website by clicking here or you can download the gov.je excel document by clicking here to calculate changes in RPI.
To find 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 end of period and multiply by 1.716 Subtract the base from beginning of 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 increase over a period when the base has not been reset within the period - this example is after 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 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% |
NOTE: 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.
