| 序号 |
时间(年) |
数据(单位：‰) |
| 1 |
2023 |
|
| 2 |
2021 |
|
| 3 |
2020 |
|
| 4 |
2019 |
|
| 5 |
2018 |
|
| 6 |
2017 |
|
| 7 |
2016 |
4.26 |
| 8 |
2015 |
5.18 |
| 9 |
2014 |
5.20 |
| 10 |
2013 |
5.46 |
| 11 |
2012 |
5.29 |
| 12 |
2011 |
5.08 |
| 13 |
2010 |
5.08 |
| 14 |
2009 |
4.90 |
| 15 |
2008 |
5.00 |
| 16 |
2007 |
5.69 |
| 17 |
2006 |
4.88 |
| 18 |
2005 |
4.10 |
| 19 |
2004 |
4.27 |
| 20 |
2003 |
3.62 |
| 21 |
2002 |
4.41 |
| 22 |
2001 |
3.97 |
| 23 |
2000 |
4.89 |
| 24 |
1999 |
5.91 |
| 25 |
1998 |
4.52 |
| 26 |
1997 |
5.37 |
| 27 |
1996 |
9.90 |
| 28 |
1995 |
8.47 |
| 29 |
1990 |
16.24 |
| 30 |
1985 |
11.80 |
| 31 |
1980 |
14.20 |
| 32 |
1979 |
12.80 |
| 33 |
1978 |
11.00 |
| 34 |
1975 |
12.80 |
| 35 |
1970 |
20.50 |
| 36 |
1965 |
18.50 |
| 37 |
1962 |
28.10 |
| 38 |
1957 |
21.50 |
| 39 |
1952 |
12.90 |
| 40 |
1949 |
17.00 |
