Tableau de données
| 1962 | 250 M | 1984 | 3,74 Md | 2006 | 2,95 Md |
| 1963 | 336 M | 1985 | 4,2 Md | 2007 | 3,31 Md |
| 1964 | 448 M | 1986 | 4,73 Md | 2008 | 3,78 Md |
| 1965 | 515 M | 1987 | 4,81 Md | 2009 | 4,02 Md |
| 1966 | 482 M | 1988 | 4,45 Md | 2010 | 4,41 Md |
| 1967 | 508 M | 1989 | 3,52 Md | 2011 | 4,46 Md |
| 1968 | 649 M | 1990 | 2,26 Md | 2012 | 4,56 Md |
| 1969 | 889 M | 1991 | 1,35 Md | 2013 | 4,36 Md |
| 1970 | 1,09 Md | 1992 | 1,42 Md | 2014 | 5,09 Md |
| 1971 | 1,27 Md | 1993 | 1,53 Md | 2015 | 5,48 Md |
| 1972 | 1,07 Md | 1994 | 1,71 Md | 2016 | 4,51 Md |
| 1973 | 1,24 Md | 1995 | 1,95 Md | 2017 | 2,77 Md |
| 1974 | 1,85 Md | 1996 | 2,12 Md | 2018 | 3,12 Md |
| 1975 | 1,93 Md | 1997 | 2,27 Md | 2019 | 3,74 Md |
| 1976 | 2,2 Md | 1998 | 2,37 Md | 2020 | 4,51 Md |
| 1977 | 2,75 Md | 1999 | 2,45 Md | 2021 | 5,17 Md |
| 1978 | 2,49 Md | 2000 | 2,63 Md | 2022 | 4,65 Md |
| 1979 | 1,15 Md | 2001 | 2,83 Md | 2023 | 3,17 Md |
| 1980 | 1,36 Md | 2002 | 2,9 Md | 2024 | 2,4 Md |
| 1981 | 1,82 Md | 2003 | 2,38 Md | 2025 | 2,5 Md |
| 1982 | 2,31 Md | 2004 | 2,37 Md | | |
| 1983 | 3 Md | 2005 | 2,66 Md | | |
Tableau de données
| 1962 | 6,7% | 1984 | 8,3% | 2006 | 2,6% |
| 1963 | 8,7% | 1985 | 7,9% | 2007 | 2,4% |
| 1964 | 10,3% | 1986 | 7,5% | 2008 | 2,2% |
| 1965 | 10,1% | 1987 | 6,5% | 2009 | 2% |
| 1966 | 8,7% | 1988 | 5,1% | 2010 | 2% |
| 1967 | 8,9% | 1989 | 4% | 2011 | 1,8% |
| 1968 | 11,1% | 1990 | 3,5% | 2012 | 1,6% |
| 1969 | 14,3% | 1991 | 3,6% | 2013 | 1,6% |
| 1970 | 16% | 1992 | 3,2% | 2014 | 1,7% |
| 1971 | 17,2% | 1993 | 3,1% | 2015 | 1,7% |
| 1972 | 13,6% | 1994 | 3,2% | 2016 | 1,7% |
| 1973 | 13,5% | 1995 | 3,1% | 2017 | 1,4% |
| 1974 | 17,3% | 1996 | 3% | 2018 | 1,2% |
| 1975 | 15,4% | 1997 | 2,8% | 2019 | 1,2% |
| 1976 | 13,7% | 1998 | 2,7% | 2020 | 1,1% |
| 1977 | 13,1% | 1999 | 2,6% | 2021 | 1,1% |
| 1978 | 9,9% | 2000 | 2,6% | 2022 | 1% |
| 1979 | 6,5% | 2001 | 3% | 2023 | 0,8% |
| 1980 | 6,2% | 2002 | 3,3% | 2024 | 0,7% |
| 1981 | 7,4% | 2003 | 3,2% | 2025 | 0,6% |
| 1982 | 7,2% | 2004 | 2,9% | | |
| 1983 | 8% | 2005 | 2,7% | | |