| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | 2.59379 |
| 2021 | 2.73303 |
| 2020 | 2.83151 |
| 2019 | 2.85915 |
| 2018 | 2.91795 |
| 2017 | 2.98534 |
| 2016 | 3.06144 |
| 2015 | 3.11634 |
| 2014 | 3.15973 |
| 2013 | 3.18612 |
| 2012 | 3.21113 |
| 2011 | 3.22378 |
| 2010 | 3.24435 |
| 2009 | 3.18265 |
| 2008 | 3.1458 |
| 2007 | 3.14556 |
| 2006 | 3.16977 |
| 2005 | 3.22074 |
| 2004 | 3.25991 |
| 2003 | 3.28019 |
| 2002 | 3.30343 |
| 2001 | 3.31196 |
| 2000 | 3.4286 |
| 1999 | 3.17254 |
| 1998 | 3.14924 |
| 1997 | 3.23902 |
| 1996 | 3.37211 |
| 1995 | 3.50459 |
| 1994 | 3.63735 |
| 1993 | 3.76638 |
| 1992 | 3.88124 |
| 1991 | 3.95806 |
| 1990 | 4.00841 |
| 1989 | 2.908 |
| 1988 | 2.54576 |
| 1987 | 2.597 |
| 1986 | 2.65636 |
| 1985 | 2.69873 |
| 1984 | 2.74177 |
| 1983 | 2.77375 |
| 1982 | 2.78557 |
| 1981 | 2.76861 |
| 1980 | 2.5445 |
| 1979 | 2.72176 |
| 1978 | 3.07874 |
| 1977 | 3.0892 |
| 1976 | 3.03063 |
| 1975 | 2.8242 |
| 1974 | 2.73981 |
| 1973 | 2.73701 |
| 1972 | 2.79971 |
| 1971 | 2.85174 |
| 1970 | 4.35011 |
| 1969 | 4.30124 |
| 1968 | 4.34078 |
| 1967 | 4.47774 |
| 1966 | 4.61794 |
| 1965 | 4.7853 |
| 1964 | 4.93067 |
| 1963 | 5.05438 |
| 1962 | 4.89988 |
| 1961 | 4.95078 |
| 1960 | - |