| 年份 | 尼日利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.000478432 |
| 2020 | 0.000239912 |
| 2019 | 0.00034419 |
| 2018 | 0.000441432 |
| 2017 | 0.000446679 |
| 2016 | 0.000315242 |
| 2015 | 0.000225611 |
| 2014 | 0.000247381 |
| 2013 | 0.000358794 |
| 2012 | 0.000544124 |
| 2011 | 0.000596459 |
| 2010 | 0.000623772 |
| 2009 | 0.000381673 |
| 2008 | 0.00092961 |
| 2007 | 0.000378312 |
| 2006 | 0.000108129 |
| 2005 | 0.000134562 |
| 2004 | 0.000219157 |
| 2003 | 0.000266977 |
| 2002 | 0.000481812 |
| 2001 | 6.70645E-5 |
| 2000 | 4.02064E-5 |
| 1999 | 0.000172706 |
| 1998 | 0.000206856 |
| 1997 | 0.000239083 |
| 1996 | 0.000254396 |
| 1995 | 0.000845576 |
| 1994 | 0.000957189 |
| 1993 | 0.00124246 |
| 1992 | 0.00310602 |
| 1991 | 0.00389523 |
| 1990 | 0.00327527 |
| 1989 | 0.00353544 |
| 1988 | 0.00257581 |
| 1987 | 0.00337791 |
| 1986 | 0.004459 |
| 1985 | 0.00416701 |
| 1984 | 0.00202313 |
| 1983 | 0.00133542 |
| 1982 | 0.00154912 |
| 1981 | 0.00268636 |
| 1980 | 0.00702974 |
| 1979 | 0.00659998 |
| 1978 | 0.0105051 |
| 1977 | 0.0100478 |
| 1976 | 0.00661863 |
| 1975 | 0.0142086 |
| 1974 | 0.0110106 |
| 1973 | 0.0111822 |
| 1972 | 0.0117219 |
| 1971 | 0.00793023 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |