_id	计	Household size	1999/2000	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06
1	1	1 person	5000	4800	4500	5000	5000	5000	5000
2	2	2 persons	8700	8400	7500	7000	6600	6500	6800
3	3┪	3 persons or above	11000	10800	10300	9700	8700	9000	9500
4	俱砰	Overall	9500	9100	8500	7000	6500	6300	6500