| 年份 | 南苏丹 |
|---|---|
| 2023 | - |
| 2022 | 3.69304 |
| 2021 | 3.58958 |
| 2020 | 3.48447 |
| 2019 | 3.38891 |
| 2018 | 3.29151 |
| 2017 | 3.17511 |
| 2016 | 3.06227 |
| 2015 | 2.9813 |
| 2014 | 2.91312 |
| 2013 | 2.85634 |
| 2012 | 2.81904 |
| 2011 | 2.78746 |
| 2010 | 2.76117 |
| 2009 | 2.73429 |
| 2008 | 2.70449 |
| 2007 | 2.67419 |
| 2006 | 2.64231 |
| 2005 | 2.6099 |
| 2004 | 2.58887 |
| 2003 | 2.59298 |
| 2002 | 2.63256 |
| 2001 | 2.70603 |
| 2000 | 2.80042 |
| 1999 | 2.89703 |
| 1998 | 2.9743 |
| 1997 | 3.02164 |
| 1996 | 3.04359 |
| 1995 | 3.0533 |
| 1994 | 3.05611 |
| 1993 | 3.06611 |
| 1992 | 3.09107 |
| 1991 | 3.11898 |
| 1990 | 3.1495 |
| 1989 | 3.1871 |
| 1988 | 3.19545 |
| 1987 | 3.21028 |
| 1986 | 3.25399 |
| 1985 | 3.28426 |
| 1984 | 3.30474 |
| 1983 | 3.31049 |
| 1982 | 3.29949 |
| 1981 | 3.28076 |
| 1980 | 3.26244 |
| 1979 | 3.24319 |
| 1978 | 3.22186 |
| 1977 | 3.20049 |
| 1976 | 3.18079 |
| 1975 | 3.16337 |
| 1974 | 3.14866 |
| 1973 | 3.13693 |
| 1972 | 3.12891 |
| 1971 | 3.12522 |
| 1970 | 3.12596 |
| 1969 | 3.13116 |
| 1968 | 3.14096 |
| 1967 | 3.15304 |
| 1966 | 3.16187 |
| 1965 | 3.16371 |
| 1964 | 3.15849 |
| 1963 | 3.14603 |
| 1962 | 3.12879 |
| 1961 | 3.11191 |
| 1960 | 3.09729 |