| 年份 | 单位：户 |
| 2010 | 3122225.15 |
| 2009 | 2972927.56 |
| 2008 | 2844162.64 |
| 2007 | 2598356.72 |
| 2006 | 2316927.83 |
| 2005 | 1730161.28 |
| 2004 | 1511291.55 |
| 2003 | 1376004.61 |
| 2002 | 1017399.39 |
| 2001 | 894504.83 |
| 2000 | 678992.50 |
| 1999 | 410121.15 |
| 1998 | 300093.75 |
| 1997 | 150033.24 |
| 1996 | 80020.65 |
| 1995 | 40023.36 |
| 1994 | 20027.23 |
| 1993 | 10025.35 |
| 1992 | 6022.68 |
| 1991 | 2009.23 |
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