How are the 1991 and 2001 Censuses comparable?
Although the 2001 Census was drawn up with a requirement to be comparable with the 1991 Census, however, changes have been necessary to take into account harmonisation with other Government surveys, changing customer requirements and new data collection methodologies. Take a look at the 2001 Census Definitions, Chapter 4 for full details on comparing the 2001 and 1991 Censuses. There is a free guide to comparing 1991 and 2001 Census ethnic group data available from the National Statistics web site.
