Tableau de données
| 1981 | 41,9% | 1997 | 22,7% | 2013 | 31,2% |
| 1982 | 42,6% | 1998 | 23,9% | 2014 | 28,4% |
| 1983 | 42,8% | 1999 | 23,3% | 2015 | 26,1% |
| 1984 | 43,5% | 2000 | 28,7% | 2016 | 24,4% |
| 1985 | 43,9% | 2001 | 30,9% | 2017 | 28,5% |
| 1986 | 39,2% | 2002 | 30,8% | 2018 | 31,3% |
| 1987 | 39,1% | 2003 | 30,3% | 2019 | 31,8% |
| 1988 | 38% | 2004 | 30,2% | 2020 | 27,9% |
| 1989 | 40,9% | 2005 | 27,5% | 2021 | 32,8% |
| 1990 | 42,3% | 2006 | 33,8% | 2022 | 34,4% |
| 1991 | 39,7% | 2007 | 37,9% | 2023 | 34,6% |
| 1992 | 21% | 2008 | 33,1% | 2024 | 38,9% |
| 1993 | 25% | 2009 | 30,3% | 2025 | 36,3% |
| 1994 | 22,4% | 2010 | 32% | 2026 | 33% |
| 1995 | 21,6% | 2011 | 33,9% | | |
| 1996 | 21,7% | 2012 | 29,8% | | |
Tableau de données
| 1981 | 3,72 Md | 1997 | 212 Md | 2013 | 5,99 Bn |
| 1982 | 4,18 Md | 1998 | 226 Md | 2014 | 6,32 Bn |
| 1983 | 4,48 Md | 1999 | 252 Md | 2015 | 5,98 Bn |
| 1984 | 4,68 Md | 2000 | 351 Md | 2016 | 5,84 Bn |
| 1985 | 4,92 Md | 2001 | 429 Md | 2017 | 7,97 Bn |
| 1986 | 4,36 Md | 2002 | 477 Md | 2018 | 10,19 Bn |
| 1987 | 4,54 Md | 2003 | 554 Md | 2019 | 12,04 Bn |
| 1988 | 4,68 Md | 2004 | 713 Md | 2020 | 10,44 Bn |
| 1989 | 5,24 Md | 2005 | 838 Md | 2021 | 14,31 Bn |
| 1990 | 5,3 Md | 2006 | 1,36 Bn | 2022 | 18,52 Bn |
| 1991 | 8,97 Md | 2007 | 1,88 Bn | 2023 | 24,39 Bn |
| 1992 | 11,8 Md | 2008 | 2,17 Bn | 2024 | 31,37 Bn |
| 1993 | 56,8 Md | 2009 | 1,99 Bn | 2025 | 32,65 Bn |
| 1994 | 85,7 Md | 2010 | 3,12 Bn | 2026 | 34,16 Bn |
| 1995 | 141 Md | 2011 | 4,47 Bn | | |
| 1996 | 160 Md | 2012 | 4,98 Bn | | |
Tableau de données
| 1981 | 45% | 1997 | 30,8% | 2013 | 32,2% |
| 1982 | 45,4% | 1998 | 36,2% | 2014 | 32,1% |
| 1983 | 45,9% | 1999 | 33,2% | 2015 | 31,2% |
| 1984 | 47% | 2000 | 34,5% | 2016 | 39,7% |
| 1985 | 47,8% | 2001 | 35,2% | 2017 | 32,2% |
| 1986 | 52% | 2002 | 35,5% | 2018 | 28,4% |
| 1987 | 52,8% | 2003 | 33,7% | 2019 | 30,8% |
| 1988 | 52,4% | 2004 | 31,8% | 2020 | 37,1% |
| 1989 | 52,7% | 2005 | 25,1% | 2021 | 35,9% |
| 1990 | 51,7% | 2006 | 26,2% | 2022 | 33,7% |
| 1991 | 46% | 2007 | 35,3% | 2023 | 31,9% |
| 1992 | 29,1% | 2008 | 37,6% | 2024 | 37,5% |
| 1993 | 38,3% | 2009 | 35,5% | 2025 | 34,6% |
| 1994 | 32,2% | 2010 | 31,6% | 2026 | 33,5% |
| 1995 | 26,6% | 2011 | 37,9% | | |
| 1996 | 28,6% | 2012 | 36,1% | | |
Tableau de données
| 1981 | 4 Md | 1997 | 288 Md | 2013 | 6,16 Bn |
| 1982 | 4,45 Md | 1998 | 342 Md | 2014 | 7,14 Bn |
| 1983 | 4,81 Md | 1999 | 359 Md | 2015 | 7,14 Bn |
| 1984 | 5,05 Md | 2000 | 423 Md | 2016 | 9,5 Bn |
| 1985 | 5,36 Md | 2001 | 490 Md | 2017 | 9,01 Bn |
| 1986 | 5,79 Md | 2002 | 550 Md | 2018 | 9,26 Bn |
| 1987 | 6,13 Md | 2003 | 616 Md | 2019 | 11,66 Bn |
| 1988 | 6,45 Md | 2004 | 751 Md | 2020 | 13,9 Bn |
| 1989 | 6,75 Md | 2005 | 764 Md | 2021 | 15,63 Bn |
| 1990 | 6,47 Md | 2006 | 1,05 Bn | 2022 | 18,16 Bn |
| 1991 | 10,4 Md | 2007 | 1,75 Bn | 2023 | 22,46 Bn |
| 1992 | 16,3 Md | 2008 | 2,47 Bn | 2024 | 30,25 Bn |
| 1993 | 87,2 Md | 2009 | 2,34 Bn | 2025 | 31,12 Bn |
| 1994 | 123 Md | 2010 | 3,08 Bn | 2026 | 34,72 Bn |
| 1995 | 173 Md | 2011 | 5 Bn | | |
| 1996 | 211 Md | 2012 | 6,02 Bn | | |