| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 15.7324 |
| 2020 | 15.7324 |
| 2019 | 15.8313 |
| 2018 | 14.5054 |
| 2017 | 14.4814 |
| 2016 | 14.462 |
| 2015 | 14.369 |
| 2014 | 12.197 |
| 2013 | 12.102 |
| 2012 | 11.9634 |
| 2011 | 11.7753 |
| 2010 | 11.7484 |
| 2009 | 10.711 |
| 2008 | 10.6023 |
| 2007 | 9.95335 |
| 2006 | 9.87228 |
| 2005 | 9.76259 |
| 2004 | 8.65643 |
| 2003 | 7.46283 |
| 2002 | 7.12607 |
| 2001 | 7.04619 |
| 2000 | 6.23031 |
| 1999 | 5.44103 |
| 1998 | 5.06928 |
| 1997 | 4.71289 |
| 1996 | 4.45482 |
| 1995 | 4.14145 |
| 1994 | 4.14145 |
| 1993 | 3.81886 |
| 1992 | 3.6591 |
| 1991 | 3.24741 |
| 1990 | 3.21054 |
| 1989 | 3.01085 |
| 1988 | 2.82651 |
| 1987 | 2.64217 |
| 1986 | 2.55 |
| 1985 | 2.47319 |
| 1984 | 2.36566 |
| 1983 | 2.2735 |
| 1982 | 2.1506 |
| 1981 | 2.05843 |
| 1980 | 1.93554 |
| 1979 | 1.84337 |
| 1978 | 1.73584 |
| 1977 | 1.72048 |
| 1976 | 1.68976 |
| 1975 | 1.65904 |
| 1974 | 1.64368 |
| 1973 | 1.62831 |
| 1972 | 1.61295 |
| 1971 | 1.59759 |
| 1970 | 1.58223 |
| 1969 | 1.56687 |
| 1968 | 1.55151 |
| 1967 | 1.53615 |
| 1966 | 1.52078 |
| 1965 | 1.50542 |
| 1964 | 1.49006 |
| 1963 | 1.4747 |
| 1962 | 1.45934 |
| 1961 | 1.44398 |
| 1960 | - |