| 年份 | 单位：户 |
| 2011 | 6036716.43 |
| 2010 | 5043549.62 |
| 2009 | 4802476.70 |
| 2008 | 4313470.27 |
| 2007 | 4038551.26 |
| 2006 | 3618224.25 |
| 2005 | 2683947.36 |
| 2004 | 2387743.31 |
| 2003 | 1977770.82 |
| 2002 | 1624458.10 |
| 2001 | 1206395.24 |
| 2000 | 1004073.36 |
| 1999 | 752211.53 |
| 1998 | 350682.54 |
| 1997 | 200220.99 |
| 1996 | 150066.04 |
| 1995 | 79997.64 |
| 1994 | 39988.66 |
| 1993 | 19993.32 |
| 1992 | 4998.77 |
| 1991 | 4999.45 |
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