| 序号 |
时间(年) |
数据(单位：-) |
| 1 |
2023 |
|
| 2 |
2022 |
|
| 3 |
2021 |
|
| 4 |
2020 |
|
| 5 |
2019 |
|
| 6 |
2018 |
|
| 7 |
2017 |
18.71 |
| 8 |
2016 |
18.99 |
| 9 |
2015 |
19.00 |
| 10 |
2014 |
19.37 |
| 11 |
2013 |
19.74 |
| 12 |
2012 |
20.59 |
| 13 |
2011 |
21.34 |
| 14 |
2010 |
23.11 |
| 15 |
2009 |
21.29 |
| 16 |
2008 |
21.39 |
| 17 |
2007 |
21.57 |
| 18 |
2006 |
21.10 |
| 19 |
2005 |
21.71 |
| 20 |
2004 |
18.69 |
| 21 |
2003 |
21.28 |
| 22 |
2002 |
21.43 |
| 23 |
2001 |
25.36 |
| 24 |
2000 |
19.30 |
| 25 |
1999 |
18.61 |
| 26 |
1998 |
19.57 |
| 27 |
1997 |
21.63 |
| 28 |
1996 |
26.54 |
| 29 |
1995 |
39.64 |
| 30 |
1990 |
13.25 |
| 31 |
1985 |
29.72 |
| 32 |
1980 |
35.51 |
| 33 |
1978 |
19.72 |
| 34 |
1975 |
31.07 |
| 35 |
1970 |
29.28 |
| 36 |
1965 |
30.04 |
| 37 |
1962 |
31.40 |
| 38 |
1957 |
35.74 |
| 39 |
1952 |
47.57 |
