| 年份 | 也门共和国 |
|---|---|
| 2023 | - |
| 2022 | 2.14463 |
| 2021 | 2.13779 |
| 2020 | 2.31045 |
| 2019 | 2.42621 |
| 2018 | 2.48636 |
| 2017 | 2.56432 |
| 2016 | 2.62154 |
| 2015 | 2.71295 |
| 2014 | 2.81107 |
| 2013 | 2.85924 |
| 2012 | 2.89303 |
| 2011 | 2.91407 |
| 2010 | 2.92949 |
| 2009 | 2.95886 |
| 2008 | 2.99112 |
| 2007 | 3.02768 |
| 2006 | 2.98323 |
| 2005 | 2.79309 |
| 2004 | 2.66183 |
| 2003 | 2.65086 |
| 2002 | 2.66583 |
| 2001 | 2.72576 |
| 2000 | 2.79878 |
| 1999 | 2.83547 |
| 1998 | 2.87749 |
| 1997 | 2.93207 |
| 1996 | 3.12387 |
| 1995 | 3.47621 |
| 1994 | 3.70115 |
| 1993 | 3.76823 |
| 1992 | 3.79804 |
| 1991 | 3.8194 |
| 1990 | 3.83138 |
| 1989 | 3.84158 |
| 1988 | 3.88214 |
| 1987 | 3.85077 |
| 1986 | 3.80918 |
| 1985 | 3.79715 |
| 1984 | 3.72276 |
| 1983 | 3.63148 |
| 1982 | 3.53812 |
| 1981 | 3.46107 |
| 1980 | 3.36976 |
| 1979 | 3.25027 |
| 1978 | 3.1496 |
| 1977 | 3.07991 |
| 1976 | 3.00108 |
| 1975 | 2.91212 |
| 1974 | 2.82389 |
| 1973 | 2.7596 |
| 1972 | 2.69172 |
| 1971 | 2.60458 |
| 1970 | 2.50984 |
| 1969 | 2.39706 |
| 1968 | 2.29583 |
| 1967 | 2.21634 |
| 1966 | 2.12786 |
| 1965 | 2.0462 |
| 1964 | 1.92005 |
| 1963 | 1.83947 |
| 1962 | 1.87229 |
| 1961 | 1.86274 |
| 1960 | - |