_id	Year	Persons per private dwelling
1	1971	2.79000000000000003552713678800500929355621337890625
2	1981	2.589999999999999857891452847979962825775146484375
3	1991	2.470000000000000195399252334027551114559173583984375
4	2001	2.37999999999999989341858963598497211933135986328125
5	2011	2.310000000000000053290705182007513940334320068359375
6	2021	2.270000000000000017763568394002504646778106689453125