| 序号 |
时间(年) |
数据(单位：-) |
| 1 |
2024 |
|
| 2 |
2023 |
|
| 3 |
2022 |
|
| 4 |
2021 |
|
| 5 |
2020 |
|
| 6 |
2019 |
|
| 7 |
2018 |
17.87 |
| 8 |
2017 |
17.68 |
| 9 |
2016 |
18.16 |
| 10 |
2015 |
17.83 |
| 11 |
2014 |
19.85 |
| 12 |
2013 |
19.65 |
| 13 |
2012 |
19.01 |
| 14 |
2011 |
19.01 |
| 15 |
2010 |
19.33 |
| 16 |
2009 |
16.39 |
| 17 |
2008 |
15.61 |
| 18 |
2007 |
16.39 |
| 19 |
2006 |
16.33 |
| 20 |
2005 |
16.98 |
| 21 |
2004 |
16.81 |
| 22 |
2003 |
16.93 |
| 23 |
2002 |
16.36 |
| 24 |
2001 |
13.15 |
| 25 |
2000 |
11.78 |
| 26 |
1999 |
7.68 |
| 27 |
1998 |
13.34 |
| 28 |
1997 |
13.67 |
| 29 |
1996 |
11.23 |
| 30 |
1995 |
11.70 |
| 31 |
1994 |
11.39 |
| 32 |
1993 |
11.14 |
| 33 |
1992 |
7.75 |
| 34 |
1991 |
7.16 |
| 35 |
1990 |
7.18 |
| 36 |
1989 |
6.79 |
| 37 |
1988 |
6.58 |
| 38 |
1987 |
5.99 |
| 39 |
1986 |
5.79 |
| 40 |
1985 |
6.09 |
