Tableau de données
| 1985 | 32,1% | 1999 | 30,7% | 2013 | 25,7% |
| 1986 | 28,5% | 2000 | 29,4% | 2014 | 29,6% |
| 1987 | 26% | 2001 | 29,5% | 2015 | 27,1% |
| 1988 | 28,3% | 2002 | 28,4% | 2016 | 27,3% |
| 1989 | 32,3% | 2003 | 33,4% | 2017 | 28,5% |
| 1990 | 33,1% | 2004 | 35,7% | 2018 | 29,1% |
| 1991 | 31,5% | 2005 | 34,4% | 2019 | 27,6% |
| 1992 | 33,8% | 2006 | 32,1% | 2020 | 25,5% |
| 1993 | 31% | 2007 | 35,1% | 2021 | 27,2% |
| 1994 | 29% | 2008 | 31,5% | 2022 | 27,9% |
| 1995 | 30,6% | 2009 | 28,4% | 2023 | 27,4% |
| 1996 | 29,9% | 2010 | 26,8% | 2024 | 27,3% |
| 1997 | 28% | 2011 | 28,1% | 2025 | 27,4% |
| 1998 | 26,7% | 2012 | 25% | 2026 | 28,2% |
Tableau de données
| 1985 | 703 M | 1999 | 2,02 Md | 2013 | 6,91 Md |
| 1986 | 709 M | 2000 | 2,01 Md | 2014 | 8,51 Md |
| 1987 | 660 M | 2001 | 2,14 Md | 2015 | 8,16 Md |
| 1988 | 738 M | 2002 | 2,22 Md | 2016 | 8,48 Md |
| 1989 | 870 M | 2003 | 2,76 Md | 2017 | 9,21 Md |
| 1990 | 1,02 Md | 2004 | 3,29 Md | 2018 | 9,8 Md |
| 1991 | 1,03 Md | 2005 | 3,54 Md | 2019 | 9,53 Md |
| 1992 | 1,37 Md | 2006 | 3,97 Md | 2020 | 8,67 Md |
| 1993 | 1,35 Md | 2007 | 4,94 Md | 2021 | 9,79 Md |
| 1994 | 1,42 Md | 2008 | 5,73 Md | 2022 | 10,6 Md |
| 1995 | 1,62 Md | 2009 | 5,54 Md | 2023 | 10,9 Md |
| 1996 | 1,65 Md | 2010 | 5,75 Md | 2024 | 11,4 Md |
| 1997 | 1,62 Md | 2011 | 6,52 Md | 2025 | 12 Md |
| 1998 | 1,71 Md | 2012 | 6,19 Md | 2026 | 13 Md |
Tableau de données
| 1985 | 39,6% | 1999 | 31,8% | 2013 | 34,5% |
| 1986 | 32,3% | 2000 | 31,2% | 2014 | 36,3% |
| 1987 | 39,3% | 2001 | 30,6% | 2015 | 32,3% |
| 1988 | 41,2% | 2002 | 31,6% | 2016 | 30% |
| 1989 | 39,1% | 2003 | 35% | 2017 | 31,7% |
| 1990 | 39,9% | 2004 | 35,1% | 2018 | 33,3% |
| 1991 | 39,6% | 2005 | 36,6% | 2019 | 32,7% |
| 1992 | 31,7% | 2006 | 34% | 2020 | 33% |
| 1993 | 32,5% | 2007 | 32,4% | 2021 | 33,8% |
| 1994 | 30,6% | 2008 | 29,6% | 2022 | 32,8% |
| 1995 | 32,1% | 2009 | 30,7% | 2023 | 33,9% |
| 1996 | 32,6% | 2010 | 26,6% | 2024 | 34,6% |
| 1997 | 30,7% | 2011 | 29,4% | 2025 | 33,7% |
| 1998 | 32,3% | 2012 | 28,3% | 2026 | 33,7% |
Tableau de données
| 1985 | 867 M | 1999 | 2,1 Md | 2013 | 9,27 Md |
| 1986 | 804 M | 2000 | 2,13 Md | 2014 | 10,5 Md |
| 1987 | 1 Md | 2001 | 2,22 Md | 2015 | 9,72 Md |
| 1988 | 1,08 Md | 2002 | 2,47 Md | 2016 | 9,29 Md |
| 1989 | 1,05 Md | 2003 | 2,9 Md | 2017 | 10,2 Md |
| 1990 | 1,22 Md | 2004 | 3,24 Md | 2018 | 11,2 Md |
| 1991 | 1,3 Md | 2005 | 3,76 Md | 2019 | 11,3 Md |
| 1992 | 1,29 Md | 2006 | 4,2 Md | 2020 | 11,2 Md |
| 1993 | 1,41 Md | 2007 | 4,55 Md | 2021 | 12,2 Md |
| 1994 | 1,5 Md | 2008 | 5,38 Md | 2022 | 12,5 Md |
| 1995 | 1,7 Md | 2009 | 5,98 Md | 2023 | 13,5 Md |
| 1996 | 1,8 Md | 2010 | 5,71 Md | 2024 | 14,4 Md |
| 1997 | 1,78 Md | 2011 | 6,8 Md | 2025 | 14,7 Md |
| 1998 | 2,06 Md | 2012 | 7,01 Md | 2026 | 15,5 Md |