| 年份 | 尼日尔  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 1.49371 | 
| 2021 | 1.50256 | 
| 2020 | 1.51151 | 
| 2019 | 1.51596 | 
| 2018 | 1.51571 | 
| 2017 | 1.51566 | 
| 2016 | 1.51547 | 
| 2015 | 1.51436 | 
| 2014 | 1.47309 | 
| 2013 | 1.39865 | 
| 2012 | 1.34017 | 
| 2011 | 1.2948 | 
| 2010 | 1.25696 | 
| 2009 | 1.27526 | 
| 2008 | 1.33712 | 
| 2007 | 1.37299 | 
| 2006 | 1.38647 | 
| 2005 | 1.38618 | 
| 2004 | 1.37854 | 
| 2003 | 1.36638 | 
| 2002 | 1.3523 | 
| 2001 | 1.33923 | 
| 2000 | 1.32724 | 
| 1999 | 1.31538 | 
| 1998 | 1.30542 | 
| 1997 | 1.29801 | 
| 1996 | 1.29102 | 
| 1995 | 1.28339 | 
| 1994 | 1.27523 | 
| 1993 | 1.26653 | 
| 1992 | 1.25784 | 
| 1991 | 1.251 | 
| 1990 | 1.2471 | 
| 1989 | 1.24573 | 
| 1988 | 1.24685 | 
| 1987 | 1.25019 | 
| 1986 | 1.2536 | 
| 1985 | 1.25568 | 
| 1984 | 1.25675 | 
| 1983 | 1.25625 | 
| 1982 | 1.25426 | 
| 1981 | 1.25244 | 
| 1980 | 1.25155 | 
| 1979 | 1.25123 | 
| 1978 | 1.25096 | 
| 1977 | 1.25071 | 
| 1976 | 1.25001 | 
| 1975 | 1.24858 | 
| 1974 | 1.24635 | 
| 1973 | 1.24293 | 
| 1972 | 1.2385 | 
| 1971 | 1.23441 | 
| 1970 | 1.23069 | 
| 1969 | 1.22693 | 
| 1968 | 1.2242 | 
| 1967 | 1.22053 | 
| 1966 | 1.21006 | 
| 1965 | 1.18863 | 
| 1964 | 1.15573 | 
| 1963 | 1.10906 | 
| 1962 | 1.05202 | 
| 1961 | 0.997909 | 
| 1960 | 0.955951 |