| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | 5.03182 |
| 2021 | 5.01556 |
| 2020 | 4.94244 |
| 2019 | 4.80513 |
| 2018 | 4.64285 |
| 2017 | 4.45536 |
| 2016 | 4.26637 |
| 2015 | 4.10054 |
| 2014 | 3.9549 |
| 2013 | 3.76097 |
| 2012 | 3.50661 |
| 2011 | 3.27687 |
| 2010 | 3.06409 |
| 2009 | 2.80483 |
| 2008 | 2.61742 |
| 2007 | 2.52523 |
| 2006 | 2.46263 |
| 2005 | 2.42113 |
| 2004 | 2.4001 |
| 2003 | 2.39609 |
| 2002 | 2.40813 |
| 2001 | 2.4368 |
| 2000 | 2.4805 |
| 1999 | 2.53929 |
| 1998 | 2.61584 |
| 1997 | 2.69729 |
| 1996 | 2.75922 |
| 1995 | 2.78887 |
| 1994 | 2.78797 |
| 1993 | 2.75318 |
| 1992 | 2.69519 |
| 1991 | 2.64635 |
| 1990 | 2.62412 |
| 1989 | 2.62372 |
| 1988 | 2.64518 |
| 1987 | 2.68453 |
| 1986 | 2.71613 |
| 1985 | 2.72521 |
| 1984 | 2.71573 |
| 1983 | 2.68762 |
| 1982 | 2.64612 |
| 1981 | 2.61399 |
| 1980 | 2.60681 |
| 1979 | 2.62618 |
| 1978 | 2.6715 |
| 1977 | 2.7343 |
| 1976 | 2.78997 |
| 1975 | 2.8205 |
| 1974 | 2.83094 |
| 1973 | 2.82179 |
| 1972 | 2.79902 |
| 1971 | 2.79107 |
| 1970 | 2.81426 |
| 1969 | 2.86639 |
| 1968 | 2.95232 |
| 1967 | 3.05925 |
| 1966 | 3.14787 |
| 1965 | 3.19772 |
| 1964 | 3.2119 |
| 1963 | 3.18948 |
| 1962 | 3.13332 |
| 1961 | 3.06834 |
| 1960 | 3.02661 |