Tableau de données
| 1980 | 22,4% | 1996 | 20% | 2012 | 15,8% |
| 1981 | 22,8% | 1997 | 19,6% | 2013 | 16,1% |
| 1982 | 23,5% | 1998 | 21,9% | 2014 | 15,4% |
| 1983 | 21,3% | 1999 | 20,4% | 2015 | 15,6% |
| 1984 | 21,3% | 2000 | 27% | 2016 | 15,3% |
| 1985 | 21,4% | 2001 | 18,7% | 2017 | 15,3% |
| 1986 | 19,7% | 2002 | 16,8% | 2018 | 15,5% |
| 1987 | 19,4% | 2003 | 17,8% | 2019 | 15,5% |
| 1988 | 21,2% | 2004 | 16,6% | 2020 | 15,2% |
| 1989 | 22,9% | 2005 | 18,4% | 2021 | 15,3% |
| 1990 | 24,4% | 2006 | 17,3% | 2022 | 16,2% |
| 1991 | 20,9% | 2007 | 16,8% | 2023 | 16,5% |
| 1992 | 22,4% | 2008 | 17% | 2024 | 16,3% |
| 1993 | 22,8% | 2009 | 16,4% | 2025 | 15,9% |
| 1994 | 22,2% | 2010 | 15% | 2026 | 15,9% |
| 1995 | 21,1% | 2011 | 16,2% | | |
Tableau de données
| 1980 | 341 Md | 1996 | 1,6 Bn | 2012 | 2,32 Bn |
| 1981 | 412 Md | 1997 | 1,7 Bn | 2013 | 2,46 Bn |
| 1982 | 454 Md | 1998 | 2,05 Bn | 2014 | 2,51 Bn |
| 1983 | 461 Md | 1999 | 2 Bn | 2015 | 2,66 Bn |
| 1984 | 516 Md | 2000 | 2,78 Bn | 2016 | 2,69 Bn |
| 1985 | 543 Md | 2001 | 1,9 Bn | 2017 | 2,75 Bn |
| 1986 | 585 Md | 2002 | 1,79 Bn | 2018 | 2,85 Bn |
| 1987 | 650 Md | 2003 | 1,95 Bn | 2019 | 2,93 Bn |
| 1988 | 765 Md | 2004 | 1,93 Bn | 2020 | 3,04 Bn |
| 1989 | 922 Md | 2005 | 2,22 Bn | 2021 | 3,32 Bn |
| 1990 | 1,09 Bn | 2006 | 2,18 Bn | 2022 | 3,69 Bn |
| 1991 | 1,05 Bn | 2007 | 2,24 Bn | 2023 | 3,89 Bn |
| 1992 | 1,26 Bn | 2008 | 2,23 Bn | 2024 | 4,18 Bn |
| 1993 | 1,42 Bn | 2009 | 2,11 Bn | 2025 | 4,55 Bn |
| 1994 | 1,5 Bn | 2010 | 2,12 Bn | 2026 | 4,86 Bn |
| 1995 | 1,56 Bn | 2011 | 2,31 Bn | | |
Tableau de données
| 1980 | 24,8% | 1996 | 27,1% | 2012 | 20,1% |
| 1981 | 25,4% | 1997 | 27,1% | 2013 | 19,3% |
| 1982 | 26,2% | 1998 | 27,2% | 2014 | 18,2% |
| 1983 | 23,1% | 1999 | 22,8% | 2015 | 17,4% |
| 1984 | 22,9% | 2000 | 32,3% | 2016 | 17,5% |
| 1985 | 23,4% | 2001 | 24,3% | 2017 | 17,3% |
| 1986 | 21,5% | 2002 | 22,1% | 2018 | 17,3% |
| 1987 | 21,2% | 2003 | 22,2% | 2019 | 17,2% |
| 1988 | 22,8% | 2004 | 21,2% | 2020 | 18,1% |
| 1989 | 32,6% | 2005 | 20,9% | 2021 | 17,3% |
| 1990 | 28,4% | 2006 | 19,5% | 2022 | 17,9% |
| 1991 | 30,2% | 2007 | 19% | 2023 | 19% |
| 1992 | 29,2% | 2008 | 19,8% | 2024 | 17,7% |
| 1993 | 28,9% | 2009 | 22,6% | 2025 | 18% |
| 1994 | 28,4% | 2010 | 20,1% | 2026 | 18% |
| 1995 | 27,9% | 2011 | 20,2% | | |
Tableau de données
| 1980 | 377 Md | 1996 | 2,18 Bn | 2012 | 2,95 Bn |
| 1981 | 458 Md | 1997 | 2,36 Bn | 2013 | 2,95 Bn |
| 1982 | 509 Md | 1998 | 2,54 Bn | 2014 | 2,95 Bn |
| 1983 | 502 Md | 1999 | 2,23 Bn | 2015 | 2,97 Bn |
| 1984 | 554 Md | 2000 | 3,34 Bn | 2016 | 3,08 Bn |
| 1985 | 594 Md | 2001 | 2,46 Bn | 2017 | 3,12 Bn |
| 1986 | 637 Md | 2002 | 2,35 Bn | 2018 | 3,19 Bn |
| 1987 | 709 Md | 2003 | 2,42 Bn | 2019 | 3,27 Bn |
| 1988 | 826 Md | 2004 | 2,46 Bn | 2020 | 3,62 Bn |
| 1989 | 1,31 Bn | 2005 | 2,52 Bn | 2021 | 3,77 Bn |
| 1990 | 1,27 Bn | 2006 | 2,45 Bn | 2022 | 4,08 Bn |
| 1991 | 1,51 Bn | 2007 | 2,54 Bn | 2023 | 4,48 Bn |
| 1992 | 1,64 Bn | 2008 | 2,59 Bn | 2024 | 4,56 Bn |
| 1993 | 1,79 Bn | 2009 | 2,91 Bn | 2025 | 5,16 Bn |
| 1994 | 1,92 Bn | 2010 | 2,83 Bn | 2026 | 5,51 Bn |
| 1995 | 2,06 Bn | 2011 | 2,88 Bn | | |