Tableau de données
| 1980 | 25,7% | 1996 | 28,4% | 2012 | 30,1% |
| 1981 | 27% | 1997 | 29% | 2013 | 30,8% |
| 1982 | 27,3% | 1998 | 28,2% | 2014 | 32,2% |
| 1983 | 27,3% | 1999 | 28,5% | 2015 | 32,9% |
| 1984 | 27,9% | 2000 | 28,3% | 2016 | 32,9% |
| 1985 | 28,4% | 2001 | 28,6% | 2017 | 32,8% |
| 1986 | 28,4% | 2002 | 27,6% | 2018 | 33,5% |
| 1987 | 29,6% | 2003 | 27,3% | 2019 | 33,4% |
| 1988 | 29,7% | 2004 | 28,1% | 2020 | 34,5% |
| 1989 | 29,7% | 2005 | 28,8% | 2021 | 35% |
| 1990 | 30,7% | 2006 | 29,7% | 2022 | 36% |
| 1991 | 30,3% | 2007 | 29,9% | 2023 | 35,4% |
| 1992 | 30,2% | 2008 | 29,7% | 2024 | 35,6% |
| 1993 | 29,1% | 2009 | 28,7% | 2025 | 35,8% |
| 1994 | 28,4% | 2010 | 28,4% | 2026 | 35,6% |
| 1995 | 28,6% | 2011 | 29,4% | | |
Tableau de données
| 1980 | 67,41 Bn | 1996 | 154,98 Bn | 2012 | 152,29 Bn |
| 1981 | 75,95 Bn | 1997 | 160,66 Bn | 2013 | 158,44 Bn |
| 1982 | 80,58 Bn | 1998 | 153,4 Bn | 2014 | 170,02 Bn |
| 1983 | 84,19 Bn | 1999 | 152,16 Bn | 2015 | 180,81 Bn |
| 1984 | 91,35 Bn | 2000 | 153,51 Bn | 2016 | 182,95 Bn |
| 1985 | 98,83 Bn | 2001 | 154,16 Bn | 2017 | 185,64 Bn |
| 1986 | 103,74 Bn | 2002 | 147,2 Bn | 2018 | 190,73 Bn |
| 1987 | 113,03 Bn | 2003 | 144,65 Bn | 2019 | 190,87 Bn |
| 1988 | 121,73 Bn | 2004 | 150,16 Bn | 2020 | 191,3 Bn |
| 1989 | 130,5 Bn | 2005 | 154,9 Bn | 2021 | 200,9 Bn |
| 1990 | 144,93 Bn | 2006 | 160,73 Bn | 2022 | 210,45 Bn |
| 1991 | 152,21 Bn | 2007 | 163,07 Bn | 2023 | 217,96 Bn |
| 1992 | 155,62 Bn | 2008 | 158,31 Bn | 2024 | 226,06 Bn |
| 1993 | 150,07 Bn | 2009 | 143,38 Bn | 2025 | 237,65 Bn |
| 1994 | 148,21 Bn | 2010 | 144,85 Bn | 2026 | 241,02 Bn |
| 1995 | 151,84 Bn | 2011 | 147,42 Bn | | |
Tableau de données
| 1980 | 30,1% | 1996 | 33,1% | 2012 | 38,4% |
| 1981 | 30,8% | 1997 | 32,4% | 2013 | 38,4% |
| 1982 | 31% | 1998 | 38,1% | 2014 | 37,8% |
| 1983 | 31,1% | 1999 | 35,2% | 2015 | 36,6% |
| 1984 | 30,5% | 2000 | 35,4% | 2016 | 36,5% |
| 1985 | 29,7% | 2001 | 34,7% | 2017 | 35,9% |
| 1986 | 29,7% | 2002 | 34,9% | 2018 | 36% |
| 1987 | 30% | 2003 | 34,6% | 2019 | 36,4% |
| 1988 | 29,2% | 2004 | 33,3% | 2020 | 43,6% |
| 1989 | 28,5% | 2005 | 33,2% | 2021 | 41,4% |
| 1990 | 28,8% | 2006 | 32,7% | 2022 | 40,2% |
| 1991 | 28,6% | 2007 | 32,8% | 2023 | 37,8% |
| 1992 | 29,6% | 2008 | 33,7% | 2024 | 37,3% |
| 1993 | 31,4% | 2009 | 38,3% | 2025 | 36,9% |
| 1994 | 32,1% | 2010 | 37,4% | 2026 | 37,6% |
| 1995 | 32,8% | 2011 | 38,4% | | |
Tableau de données
| 1980 | 78,72 Bn | 1996 | 180,95 Bn | 2012 | 193,85 Bn |
| 1981 | 86,53 Bn | 1997 | 179,72 Bn | 2013 | 197,65 Bn |
| 1982 | 91,58 Bn | 1998 | 207,25 Bn | 2014 | 199,49 Bn |
| 1983 | 96,11 Bn | 1999 | 187,82 Bn | 2015 | 200,79 Bn |
| 1984 | 99,74 Bn | 2000 | 192,49 Bn | 2016 | 202,83 Bn |
| 1985 | 103,5 Bn | 2001 | 187,11 Bn | 2017 | 202,86 Bn |
| 1986 | 108,6 Bn | 2002 | 185,63 Bn | 2018 | 204,63 Bn |
| 1987 | 114,37 Bn | 2003 | 183,6 Bn | 2019 | 208,28 Bn |
| 1988 | 119,75 Bn | 2004 | 178,3 Bn | 2020 | 241,37 Bn |
| 1989 | 125,22 Bn | 2005 | 178,51 Bn | 2021 | 237,17 Bn |
| 1990 | 135,89 Bn | 2006 | 176,92 Bn | 2022 | 235,18 Bn |
| 1991 | 143,98 Bn | 2007 | 178,63 Bn | 2023 | 232,71 Bn |
| 1992 | 152,73 Bn | 2008 | 180 Bn | 2024 | 236,64 Bn |
| 1993 | 162,13 Bn | 2009 | 191,44 Bn | 2025 | 244,65 Bn |
| 1994 | 167,5 Bn | 2010 | 191,02 Bn | 2026 | 254,88 Bn |
| 1995 | 174,25 Bn | 2011 | 192,62 Bn | | |