Tabella dei dati
| 1981 | 33,2% | 1997 | 22,4% | 2013 | 30,9% |
| 1982 | 8,1% | 1998 | 22,3% | 2014 | 32% |
| 1983 | 11% | 1999 | 22,8% | 2015 | 31,2% |
| 1984 | 3,2% | 2000 | 22,9% | 2016 | 26,9% |
| 1985 | 10,7% | 2001 | 22,5% | 2017 | 25,1% |
| 1986 | 17,5% | 2002 | 21,8% | 2018 | 24,6% |
| 1987 | 15% | 2003 | 21,5% | 2019 | 24,1% |
| 1988 | 15,6% | 2004 | 24,1% | 2020 | 21% |
| 1989 | 16,9% | 2005 | 27,6% | 2021 | 21,6% |
| 1990 | 16,4% | 2006 | 30,6% | 2022 | 25% |
| 1991 | 17,9% | 2007 | 27,6% | 2023 | 24% |
| 1992 | 18,7% | 2008 | 34,2% | 2024 | 24,8% |
| 1993 | 18,9% | 2009 | 31,2% | 2025 | 20,6% |
| 1994 | 21,3% | 2010 | 28,9% | 2026 | 19,7% |
| 1995 | 21,4% | 2011 | 31,3% | | |
| 1996 | 21,6% | 2012 | 32,8% | | |
Tabella dei dati
| 1981 | 0 mln | 1997 | 10,4 mld | 2013 | 76,3 mld |
| 1982 | 0 mln | 1998 | 11,6 mld | 2014 | 86,3 mld |
| 1983 | 0 mln | 1999 | 12,3 mld | 2015 | 85,7 mld |
| 1984 | 1 mln | 2000 | 13,3 mld | 2016 | 76,8 mld |
| 1985 | 284 mln | 2001 | 13,5 mld | 2017 | 79,8 mld |
| 1986 | 1,49 mld | 2002 | 13,9 mld | 2018 | 82,2 mld |
| 1987 | 1,49 mld | 2003 | 14,9 mld | 2019 | 81,7 mld |
| 1988 | 1,89 mld | 2004 | 18,7 mld | 2020 | 61,3 mld |
| 1989 | 2,4 mld | 2005 | 23,8 mld | 2021 | 71,3 mld |
| 1990 | 2,84 mld | 2006 | 31,5 mld | 2022 | 88,1 mld |
| 1991 | 3,82 mld | 2007 | 32 mld | 2023 | 86,9 mld |
| 1992 | 4,59 mld | 2008 | 46,9 mld | 2024 | 94,1 mld |
| 1993 | 5,16 mld | 2009 | 43,6 mld | 2025 | 90,7 mld |
| 1994 | 6,57 mld | 2010 | 45,7 mld | 2026 | 109 mld |
| 1995 | 7,73 mld | 2011 | 60,2 mld | | |
| 1996 | 9,06 mld | 2012 | 70,7 mld | | |
Tabella dei dati
| 1981 | 41,8% | 1997 | 25,3% | 2013 | 30,4% |
| 1982 | 22,4% | 1998 | 26,8% | 2014 | 34,9% |
| 1983 | 28,7% | 1999 | 26,3% | 2015 | 37% |
| 1984 | 26% | 2000 | 26,2% | 2016 | 32,9% |
| 1985 | 19,5% | 2001 | 28,6% | 2017 | 31,6% |
| 1986 | 19,9% | 2002 | 29,6% | 2018 | 31,4% |
| 1987 | 21,8% | 2003 | 28,6% | 2019 | 30,1% |
| 1988 | 21,5% | 2004 | 29% | 2020 | 31,9% |
| 1989 | 21,8% | 2005 | 29,5% | 2021 | 29,4% |
| 1990 | 20,4% | 2006 | 26,6% | 2022 | 31,2% |
| 1991 | 21,6% | 2007 | 28,9% | 2023 | 33,5% |
| 1992 | 22,6% | 2008 | 31,1% | 2024 | 33,5% |
| 1993 | 24,3% | 2009 | 28,9% | 2025 | 32,2% |
| 1994 | 24% | 2010 | 27,5% | 2026 | 29% |
| 1995 | 23,1% | 2011 | 30,6% | | |
| 1996 | 23,3% | 2012 | 31,3% | | |
Tabella dei dati
| 1981 | 0 mln | 1997 | 11,8 mld | 2013 | 75,1 mld |
| 1982 | 0 mln | 1998 | 14 mld | 2014 | 94 mld |
| 1983 | 0 mln | 1999 | 14,1 mld | 2015 | 102 mld |
| 1984 | 6 mln | 2000 | 15,2 mld | 2016 | 93,8 mld |
| 1985 | 515 mln | 2001 | 17,2 mld | 2017 | 100 mld |
| 1986 | 1,69 mld | 2002 | 18,9 mld | 2018 | 105 mld |
| 1987 | 2,17 mld | 2003 | 19,8 mld | 2019 | 102 mld |
| 1988 | 2,59 mld | 2004 | 22,5 mld | 2020 | 93,4 mld |
| 1989 | 3,1 mld | 2005 | 25,6 mld | 2021 | 97,4 mld |
| 1990 | 3,52 mld | 2006 | 27,4 mld | 2022 | 110 mld |
| 1991 | 4,63 mld | 2007 | 33,6 mld | 2023 | 121 mld |
| 1992 | 5,56 mld | 2008 | 42,6 mld | 2024 | 127 mld |
| 1993 | 6,65 mld | 2009 | 40,4 mld | 2025 | 142 mld |
| 1994 | 7,4 mld | 2010 | 43,4 mld | 2026 | 161 mld |
| 1995 | 8,31 mld | 2011 | 58,8 mld | | |
| 1996 | 9,78 mld | 2012 | 67,4 mld | | |