| 序号 | 时间 (年) |
数据 (人/户) |
|---|---|---|
| 1 | 2019 | |
| 2 | 2018 | |
| 3 | 2017 | |
| 4 | 2016 | |
| 5 | 2015 | |
| 6 | 2014 | |
| 7 | 2013 | 3.14 |
| 8 | 2012 | 3.36 |
| 9 | 2011 | 3.39 |
| 10 | 2010 | 3.49 |
| 11 | 2009 | 3.52 |
| 12 | 2008 | 3.54 |
| 13 | 2007 | 3.56 |
| 14 | 2006 | 3.55 |
| 15 | 2005 | 3.51 |
| 16 | 2004 | 3.57 |
| 17 | 2003 | 3.58 |
| 18 | 2002 | 3.59 |
| 19 | 2001 | 3.58 |
| 20 | 2000 | 3.68 |
| 21 | 1999 | 3.78 |
| 22 | 1998 | 3.85 |
| 23 | 1997 | 3.86 |
| 24 | 1996 | 3.90 |
| 25 | 1995 | 4.05 |
| 26 | 1994 | 3.97 |
| 27 | 1993 | 4.01 |
| 28 | 1992 | 4.12 |
| 29 | 1991 | 4.40 |
| 30 | 1990 | 4.40 |
| 31 | 1989 | 4.49 |
| 32 | 1988 | 4.51 |
| 33 | 1987 | 4.53 |
| 34 | 1986 | 4.60 |
| 35 | 1985 | 4.90 |
