| 序号 |
时间(年) |
数据(单位：-) |
| 1 |
2024 |
|
| 2 |
2023 |
|
| 3 |
2022 |
|
| 4 |
2021 |
|
| 5 |
2020 |
|
| 6 |
2019 |
|
| 7 |
2018 |
33.01 |
| 8 |
2017 |
32.63 |
| 9 |
2016 |
32.25 |
| 10 |
2015 |
32.03 |
| 11 |
2014 |
31.82 |
| 12 |
2013 |
31.56 |
| 13 |
2012 |
31.28 |
| 14 |
2011 |
31.14 |
| 15 |
2010 |
31.28 |
| 16 |
2009 |
31.23 |
| 17 |
2008 |
30.80 |
| 18 |
2007 |
30.28 |
| 19 |
2006 |
29.41 |
| 20 |
2005 |
28.30 |
| 21 |
2004 |
27.27 |
| 22 |
2003 |
26.34 |
| 23 |
2002 |
25.59 |
| 24 |
2001 |
24.91 |
| 25 |
2000 |
24.25 |
| 26 |
1999 |
23.65 |
| 27 |
1998 |
23.20 |
| 28 |
1997 |
22.92 |
| 29 |
1996 |
22.75 |
| 30 |
1995 |
22.53 |
| 31 |
1994 |
22.23 |
| 32 |
1993 |
21.93 |
| 33 |
1992 |
21.75 |
| 34 |
1991 |
21.65 |
| 35 |
1990 |
21.53 |
| 36 |
1989 |
21.49 |
| 37 |
1988 |
21.48 |
| 38 |
1987 |
21.35 |
| 39 |
1986 |
21.14 |
| 40 |
1985 |
20.92 |
| 41 |
1984 |
20.89 |
| 42 |
1983 |
21.35 |
| 43 |
1982 |
22.14 |
| 44 |
1981 |
22.97 |
| 45 |
1980 |
23.65 |
| 46 |
1979 |
23.93 |
| 47 |
1978 |
23.91 |
| 48 |
1977 |
23.74 |
| 49 |
1976 |
23.53 |
| 50 |
1975 |
23.30 |
| 51 |
1974 |
22.96 |
| 52 |
1973 |
22.63 |
| 53 |
1972 |
22.34 |
| 54 |
1971 |
22.03 |
| 55 |
1970 |
21.63 |
| 56 |
1969 |
21.25 |
| 57 |
1968 |
20.95 |
| 58 |
1967 |
20.44 |
| 59 |
1966 |
19.82 |
| 60 |
1965 |
19.33 |
| 61 |
1964 |
18.89 |
| 62 |
1963 |
18.43 |
| 63 |
1962 |
18.02 |
| 64 |
1961 |
17.54 |
| 65 |
1960 |
17.07 |
