Peter Stokes, from the Office for National Statistics, says changing numbers of Welsh speakers in different parts of the country can partly be explained by migration within Wales.
More top news
As part of our special reports on education this week, Jonathan Hill has been back to his former secondary school, Whitchurch High.
Trefor Lloyd Hughes said that he is livid" about the Olympics but does not think the Welsh FA can block the move.
Swansea manager Garry Monk insists his skipper Ashley Williams isn't for sale after claims the captain should be playing for a top-six club.