| 年份 | 苏丹 |
|---|---|
| 2023 | - |
| 2022 | 0.281074 |
| 2021 | 0.279006 |
| 2020 | 0.279359 |
| 2019 | 0.279126 |
| 2018 | 0.277645 |
| 2017 | 0.276091 |
| 2016 | 0.276193 |
| 2015 | 0.278812 |
| 2014 | 0.281984 |
| 2013 | 0.286994 |
| 2012 | 0.294124 |
| 2011 | 0.302133 |
| 2010 | 0.31054 |
| 2009 | 0.315614 |
| 2008 | 0.316018 |
| 2007 | 0.312133 |
| 2006 | 0.304634 |
| 2005 | 0.295912 |
| 2004 | 0.286939 |
| 2003 | 0.27767 |
| 2002 | 0.268114 |
| 2001 | 0.258556 |
| 2000 | 0.248383 |
| 1999 | 0.237874 |
| 1998 | 0.233283 |
| 1997 | 0.232094 |
| 1996 | 0.228063 |
| 1995 | 0.223823 |
| 1994 | 0.219285 |
| 1993 | 0.217244 |
| 1992 | 0.216225 |
| 1991 | 0.212358 |
| 1990 | 0.208475 |
| 1989 | 0.206006 |
| 1988 | 0.209014 |
| 1987 | 0.214357 |
| 1986 | 0.215159 |
| 1985 | 0.215222 |
| 1984 | 0.21683 |
| 1983 | 0.218934 |
| 1982 | 0.221139 |
| 1981 | 0.223942 |
| 1980 | 0.227798 |
| 1979 | 0.23201 |
| 1978 | 0.236509 |
| 1977 | 0.241278 |
| 1976 | 0.246044 |
| 1975 | 0.250875 |
| 1974 | 0.256052 |
| 1973 | 0.260098 |
| 1972 | 0.263289 |
| 1971 | 0.267419 |
| 1970 | 0.272112 |
| 1969 | 0.2767 |
| 1968 | 0.280596 |
| 1967 | 0.283853 |
| 1966 | 0.286904 |
| 1965 | 0.289969 |
| 1964 | 0.292703 |
| 1963 | 0.295273 |
| 1962 | 0.296279 |
| 1961 | 0.295007 |
| 1960 | 0.293002 |