| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | 4.41255 |
| 2021 | 4.42127 |
| 2020 | 4.3714 |
| 2019 | 4.25561 |
| 2018 | 4.11364 |
| 2017 | 3.94268 |
| 2016 | 3.76615 |
| 2015 | 3.60619 |
| 2014 | 3.45921 |
| 2013 | 3.2677 |
| 2012 | 3.01946 |
| 2011 | 2.79249 |
| 2010 | 2.58451 |
| 2009 | 2.33849 |
| 2008 | 2.16193 |
| 2007 | 2.07962 |
| 2006 | 2.02713 |
| 2005 | 1.99133 |
| 2004 | 1.97174 |
| 2003 | 1.96572 |
| 2002 | 1.97273 |
| 2001 | 1.99316 |
| 2000 | 2.02544 |
| 1999 | 2.07297 |
| 1998 | 2.13768 |
| 1997 | 2.20542 |
| 1996 | 2.25685 |
| 1995 | 2.28259 |
| 1994 | 2.28464 |
| 1993 | 2.26053 |
| 1992 | 2.21851 |
| 1991 | 2.18499 |
| 1990 | 2.17421 |
| 1989 | 2.18169 |
| 1988 | 2.20585 |
| 1987 | 2.24433 |
| 1986 | 2.27946 |
| 1985 | 2.29957 |
| 1984 | 2.30758 |
| 1983 | 2.30365 |
| 1982 | 2.28984 |
| 1981 | 2.28104 |
| 1980 | 2.2888 |
| 1979 | 2.30611 |
| 1978 | 2.34275 |
| 1977 | 2.40218 |
| 1976 | 2.45491 |
| 1975 | 2.48794 |
| 1974 | 2.50659 |
| 1973 | 2.50849 |
| 1972 | 2.49761 |
| 1971 | 2.49906 |
| 1970 | 2.52643 |
| 1969 | 2.57858 |
| 1968 | 2.66215 |
| 1967 | 2.76401 |
| 1966 | 2.84638 |
| 1965 | 2.89265 |
| 1964 | 2.90626 |
| 1963 | 2.88425 |
| 1962 | 2.82854 |
| 1961 | 2.76283 |
| 1960 | 2.71881 |