| 年份 | 单位：户 |
| 2010 | 5455217.29 |
| 2009 | 4955586.38 |
| 2008 | 4455902.43 |
| 2007 | 4464922.35 |
| 2006 | 4020557.16 |
| 2005 | 3689227.68 |
| 2004 | 3338887.20 |
| 2003 | 3105205.23 |
| 2002 | 2018984.69 |
| 2001 | 1877400.64 |
| 2000 | 1698287.48 |
| 1999 | 1517527.31 |
| 1998 | 1011951.14 |
| 1997 | 505764.95 |
| 1996 | 303126.76 |
| 1995 | 151300.52 |
| 1994 | 72448.07 |
| 1993 | 45142.98 |
| 1992 | 24997.75 |
| 1991 | 9969.27 |
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