| 序号 |
时间(年) |
数据(单位：‰) |
| 1 |
2024 |
|
| 2 |
2023 |
|
| 3 |
2022 |
|
| 4 |
2021 |
|
| 5 |
2020 |
|
| 6 |
2019 |
|
| 7 |
2018 |
263.61 |
| 8 |
2017 |
272.81 |
| 9 |
2016 |
281.38 |
| 10 |
2015 |
287.84 |
| 11 |
2014 |
296.52 |
| 12 |
2013 |
305.24 |
| 13 |
2012 |
313.65 |
| 14 |
2011 |
323.32 |
| 15 |
2010 |
331.54 |
| 16 |
2009 |
336.63 |
| 17 |
2008 |
340.23 |
| 18 |
2007 |
345.99 |
| 19 |
2006 |
350.66 |
| 20 |
2005 |
361.86 |
| 21 |
2004 |
353.01 |
| 22 |
2003 |
356.60 |
| 23 |
2002 |
354.68 |
| 24 |
2001 |
339.41 |
| 25 |
2000 |
322.11 |
| 26 |
1999 |
313.75 |
| 27 |
1998 |
322.08 |
| 28 |
1997 |
335.48 |
| 29 |
1996 |
336.59 |
| 30 |
1995 |
317.58 |
| 31 |
1994 |
318.11 |
| 32 |
1993 |
318.07 |
| 33 |
1992 |
319.09 |
| 34 |
1991 |
319.51 |
| 35 |
1990 |
321.35 |
| 36 |
1989 |
322.03 |
| 37 |
1988 |
323.51 |
| 38 |
1987 |
325.15 |
| 39 |
1986 |
326.11 |
| 40 |
1985 |
319.61 |
| 41 |
1984 |
311.33 |
| 42 |
1983 |
312.86 |
| 43 |
1982 |
314.29 |
| 44 |
1981 |
313.84 |
| 45 |
1980 |
314.02 |
| 46 |
1979 |
314.16 |
| 47 |
1978 |
314.98 |
| 48 |
1977 |
315.18 |
| 49 |
1976 |
315.57 |
| 50 |
1975 |
307.22 |
| 51 |
1974 |
316.09 |
| 52 |
1973 |
327.75 |
| 53 |
1972 |
338.85 |
| 54 |
1971 |
352.54 |
| 55 |
1970 |
363.73 |
| 56 |
1969 |
372.14 |
| 57 |
1968 |
375.98 |
| 58 |
1967 |
382.74 |
| 59 |
1966 |
390.78 |
| 60 |
1965 |
398.06 |
| 61 |
1964 |
404.68 |
| 62 |
1963 |
414.92 |
| 63 |
1962 |
425.57 |
| 64 |
1961 |
437.19 |
| 65 |
1960 |
449.19 |
