| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | 2.06173 |
| 2021 | 1.90466 |
| 2020 | 1.75977 |
| 2019 | 1.58292 |
| 2018 | 1.45945 |
| 2017 | 1.40465 |
| 2016 | 1.37106 |
| 2015 | 1.34878 |
| 2014 | 1.3367 |
| 2013 | 1.33292 |
| 2012 | 1.33736 |
| 2011 | 1.35042 |
| 2010 | 1.37099 |
| 2009 | 1.39778 |
| 2008 | 1.43172 |
| 2007 | 1.46682 |
| 2006 | 1.49055 |
| 2005 | 1.49679 |
| 2004 | 1.48689 |
| 2003 | 1.45824 |
| 2002 | 1.41594 |
| 2001 | 1.3776 |
| 2000 | 1.35273 |
| 1999 | 1.33943 |
| 1998 | 1.33827 |
| 1997 | 1.34746 |
| 1996 | 1.35515 |
| 1995 | 1.35482 |
| 1994 | 1.34838 |
| 1993 | 1.33603 |
| 1992 | 1.31932 |
| 1991 | 1.30651 |
| 1990 | 1.30369 |
| 1989 | 1.31066 |
| 1988 | 1.32801 |
| 1987 | 1.35318 |
| 1986 | 1.37547 |
| 1985 | 1.38746 |
| 1984 | 1.38907 |
| 1983 | 1.3779 |
| 1982 | 1.35599 |
| 1981 | 1.33924 |
| 1980 | 1.33751 |
| 1979 | 1.34366 |
| 1978 | 1.36566 |
| 1977 | 1.40579 |
| 1976 | 1.438 |
| 1975 | 1.45208 |
| 1974 | 1.45549 |
| 1973 | 1.44429 |
| 1972 | 1.41813 |
| 1971 | 1.39146 |
| 1970 | 1.37147 |
| 1969 | 1.35852 |
| 1968 | 1.3552 |
| 1967 | 1.35836 |
| 1966 | 1.35763 |
| 1965 | 1.35188 |
| 1964 | 1.34348 |
| 1963 | 1.33457 |
| 1962 | 1.32222 |
| 1961 | 1.30337 |
| 1960 | 1.28426 |