| 年份 | 也门共和国 |
|---|---|
| 2023 | - |
| 2022 | 1.09445 |
| 2021 | 1.10497 |
| 2020 | 1.29297 |
| 2019 | 1.42529 |
| 2018 | 1.50317 |
| 2017 | 1.59689 |
| 2016 | 1.67105 |
| 2015 | 1.77901 |
| 2014 | 1.8948 |
| 2013 | 1.95874 |
| 2012 | 2.01092 |
| 2011 | 2.04847 |
| 2010 | 2.08004 |
| 2009 | 2.12665 |
| 2008 | 2.17579 |
| 2007 | 2.22886 |
| 2006 | 2.2006 |
| 2005 | 2.0277 |
| 2004 | 1.90919 |
| 2003 | 1.91347 |
| 2002 | 1.94204 |
| 2001 | 2.01801 |
| 2000 | 2.10274 |
| 1999 | 2.15361 |
| 1998 | 2.20955 |
| 1997 | 2.27779 |
| 1996 | 2.4804 |
| 1995 | 2.77693 |
| 1994 | 2.9369 |
| 1993 | 3.0239 |
| 1992 | 3.07066 |
| 1991 | 3.11119 |
| 1990 | 3.14321 |
| 1989 | 3.1706 |
| 1988 | 3.22802 |
| 1987 | 3.21446 |
| 1986 | 3.27484 |
| 1985 | 3.3327 |
| 1984 | 3.26773 |
| 1983 | 3.18576 |
| 1982 | 3.10162 |
| 1981 | 3.03483 |
| 1980 | 2.95011 |
| 1979 | 2.84189 |
| 1978 | 2.74878 |
| 1977 | 2.68895 |
| 1976 | 2.61635 |
| 1975 | 2.53704 |
| 1974 | 2.45603 |
| 1973 | 2.40123 |
| 1972 | 2.34041 |
| 1971 | 2.26028 |
| 1970 | 1.952 |
| 1969 | 1.8617 |
| 1968 | 1.77695 |
| 1967 | 1.7182 |
| 1966 | 1.64903 |
| 1965 | 1.5842 |
| 1964 | 1.47579 |
| 1963 | 1.41156 |
| 1962 | 1.46058 |
| 1961 | 1.46703 |
| 1960 | - |