| 年份 | 越南 |
|---|---|
| 2023 | - |
| 2022 | -0.424481 |
| 2021 | -0.298614 |
| 2020 | -0.223584 |
| 2019 | -0.208088 |
| 2018 | -0.162866 |
| 2017 | -0.110529 |
| 2016 | -0.055477 |
| 2015 | -0.00075218 |
| 2014 | 0.0459819 |
| 2013 | 0.0794563 |
| 2012 | 0.0921858 |
| 2011 | 0.110106 |
| 2010 | 0.130511 |
| 2009 | 0.130795 |
| 2008 | 0.103648 |
| 2007 | 0.102872 |
| 2006 | 0.130946 |
| 2005 | 0.185381 |
| 2004 | 0.217258 |
| 2003 | 0.245254 |
| 2002 | 0.260088 |
| 2001 | 0.281156 |
| 2000 | 0.383048 |
| 1999 | 0.69845 |
| 1998 | 0.868347 |
| 1997 | 0.952547 |
| 1996 | 1.08557 |
| 1995 | 1.21792 |
| 1994 | 1.35052 |
| 1993 | 1.48538 |
| 1992 | 1.5941 |
| 1991 | 1.67072 |
| 1990 | 1.72718 |
| 1989 | 2.03337 |
| 1988 | 2.14149 |
| 1987 | 2.19808 |
| 1986 | 2.25012 |
| 1985 | 2.29785 |
| 1984 | 2.33991 |
| 1983 | 2.3709 |
| 1982 | 2.38172 |
| 1981 | 2.3702 |
| 1980 | 2.08059 |
| 1979 | 2.08171 |
| 1978 | 2.44266 |
| 1977 | 2.4506 |
| 1976 | 2.38947 |
| 1975 | 2.18706 |
| 1974 | 2.1001 |
| 1973 | 2.10137 |
| 1972 | 2.16151 |
| 1971 | 2.21094 |
| 1970 | 1.72652 |
| 1969 | 1.68112 |
| 1968 | 1.71755 |
| 1967 | 1.85863 |
| 1966 | 1.99618 |
| 1965 | 2.16102 |
| 1964 | 2.31169 |
| 1963 | 2.42593 |
| 1962 | 2.27752 |
| 1961 | 2.33526 |
| 1960 | - |