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This statistic is using original data from the Office for National Statistics and includes copyright material from © Crown, licensed under the .

The source advises caution when comparing data over time due to changes in methodology.

Years with the same methodology provided below:

1999-2003: Original methodology
2004-2006: Revised methodology
2007-2011: SOC00 methodology
2012-2021: SOC10 methodology
2022-2025: SOC20 methodology 

SOC = "Standard Occupational Classification" methodology.

Years with the same methodology provided below:

1997-2004: Original methodology
2004-2006: Revised methodology
2007-2011:SOC00 methodology
2012-2021: SOC10 methodology
2022-2023: SOC20 methodology

SOC = "Standard Occupational Classification"