| 年份 | 南苏丹 |
|---|---|
| 2023 | - |
| 2022 | 12.9446 |
| 2021 | 13.5101 |
| 2020 | 14.2865 |
| 2019 | 15.3027 |
| 2018 | 16.3441 |
| 2017 | 16.8523 |
| 2016 | 16.8442 |
| 2015 | 16.8135 |
| 2014 | 16.6239 |
| 2013 | 16.3479 |
| 2012 | 16.2681 |
| 2011 | 16.2242 |
| 2010 | 16.3616 |
| 2009 | 16.6185 |
| 2008 | 16.9238 |
| 2007 | 17.3881 |
| 2006 | 17.9464 |
| 2005 | 18.4703 |
| 2004 | 18.8935 |
| 2003 | 19.1169 |
| 2002 | 19.1372 |
| 2001 | 19.1278 |
| 2000 | 19.1683 |
| 1999 | 19.2456 |
| 1998 | 19.6366 |
| 1997 | 20.0293 |
| 1996 | 20.082 |
| 1995 | 20.1072 |
| 1994 | 20.1754 |
| 1993 | 19.9383 |
| 1992 | 19.2488 |
| 1991 | 18.5788 |
| 1990 | 18.131 |
| 1989 | 17.7107 |
| 1988 | 18.3984 |
| 1987 | 19.0794 |
| 1986 | 18.6655 |
| 1985 | 18.2839 |
| 1984 | 17.9849 |
| 1983 | 17.8198 |
| 1982 | 17.8113 |
| 1981 | 17.8925 |
| 1980 | 17.9697 |
| 1979 | 18.0355 |
| 1978 | 18.0881 |
| 1977 | 18.1178 |
| 1976 | 18.1145 |
| 1975 | 18.0706 |
| 1974 | 17.975 |
| 1973 | 17.832 |
| 1972 | 17.6891 |
| 1971 | 17.5531 |
| 1970 | 17.4588 |
| 1969 | 17.4367 |
| 1968 | 17.4233 |
| 1967 | 17.4125 |
| 1966 | 17.4249 |
| 1965 | 17.4232 |
| 1964 | 17.3601 |
| 1963 | 17.3087 |
| 1962 | 17.257 |
| 1961 | 17.1554 |
| 1960 | 17.0503 |