Statistical bulletin 2006: Figure GPS-30
Statistical bulletin 2007: Figure GPS-23
Statistical bulletin 2008: Figure GPS-23 part (i)
Statistical bulletin 2009: Figure GPS-23 part (i)
See also Table GPS-48 part ii
See 'General notes for interpreting data' on the Explanatory notes and help page
Reitox national reports 2009, taken from population surveys reports or scientific articles.
(see the help page for information about formats etc.)