| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | 4.93593 |
| 2021 | 4.94182 |
| 2020 | 4.92616 |
| 2019 | 4.95098 |
| 2018 | 4.95341 |
| 2017 | 4.94325 |
| 2016 | 4.95732 |
| 2015 | 4.91259 |
| 2014 | 4.7957 |
| 2013 | 4.64509 |
| 2012 | 4.46028 |
| 2011 | 4.26588 |
| 2010 | 4.08745 |
| 2009 | 3.92259 |
| 2008 | 3.70069 |
| 2007 | 3.40898 |
| 2006 | 3.14075 |
| 2005 | 2.89474 |
| 2004 | 2.60866 |
| 2003 | 2.40497 |
| 2002 | 2.31061 |
| 2001 | 2.25087 |
| 2000 | 2.21078 |
| 1999 | 2.19591 |
| 1998 | 2.20342 |
| 1997 | 2.2273 |
| 1996 | 2.26933 |
| 1995 | 2.32857 |
| 1994 | 2.40345 |
| 1993 | 2.49551 |
| 1992 | 2.59327 |
| 1991 | 2.67284 |
| 1990 | 2.72084 |
| 1989 | 2.73825 |
| 1988 | 2.71992 |
| 1987 | 2.67563 |
| 1986 | 2.64034 |
| 1985 | 2.63294 |
| 1984 | 2.64842 |
| 1983 | 2.68541 |
| 1982 | 2.74035 |
| 1981 | 2.79 |
| 1980 | 2.81975 |
| 1979 | 2.81686 |
| 1978 | 2.80185 |
| 1977 | 2.79642 |
| 1976 | 2.7983 |
| 1975 | 2.82138 |
| 1974 | 2.86921 |
| 1973 | 2.94304 |
| 1972 | 3.03592 |
| 1971 | 3.12054 |
| 1970 | 3.17586 |
| 1969 | 3.20366 |
| 1968 | 3.20483 |
| 1967 | 3.18396 |
| 1966 | 3.17606 |
| 1965 | 3.20879 |
| 1964 | 3.2786 |
| 1963 | 3.39007 |
| 1962 | 3.52947 |
| 1961 | 3.63906 |
| 1960 | 3.7003 |