Tabella dei dati
| 1980 | 20,4% | 1996 | 21,5% | 2012 | 30,5% |
| 1981 | 15,5% | 1997 | 22,7% | 2013 | 29,4% |
| 1982 | 18,2% | 1998 | 23,1% | 2014 | 31,5% |
| 1983 | 16,5% | 1999 | 24,6% | 2015 | 28,6% |
| 1984 | 17,9% | 2000 | 23,5% | 2016 | 25,6% |
| 1985 | 17,9% | 2001 | 23,3% | 2017 | 28% |
| 1986 | 16,5% | 2002 | 22,8% | 2018 | 25% |
| 1987 | 18,8% | 2003 | 23,8% | 2019 | 26,5% |
| 1988 | 20,2% | 2004 | 27% | 2020 | 28% |
| 1989 | 21,7% | 2005 | 27,3% | 2021 | 24,7% |
| 1990 | 23,7% | 2006 | 36,2% | 2022 | 23,6% |
| 1991 | 22,9% | 2007 | 32,8% | 2023 | 30,9% |
| 1992 | 22% | 2008 | 35% | 2024 | 32,5% |
| 1993 | 19,8% | 2009 | 30,9% | 2025 | 29,6% |
| 1994 | 20% | 2010 | 21,7% | 2026 | 31,5% |
| 1995 | 20,7% | 2011 | 21,3% | | |
Tabella dei dati
| 1980 | 156 mln | 1996 | 1,7 mld | 2012 | 12,2 mld |
| 1981 | 136 mln | 1997 | 2,04 mld | 2013 | 12,9 mld |
| 1982 | 184 mln | 1998 | 2,28 mld | 2014 | 14,9 mld |
| 1983 | 186 mln | 1999 | 2,65 mld | 2015 | 14,6 mld |
| 1984 | 221 mln | 2000 | 2,83 mld | 2016 | 14,3 mld |
| 1985 | 243 mln | 2001 | 3,11 mld | 2017 | 16,8 mld |
| 1986 | 256 mln | 2002 | 3,43 mld | 2018 | 15,7 mld |
| 1987 | 337 mln | 2003 | 3,91 mld | 2019 | 17,8 mld |
| 1988 | 428 mln | 2004 | 4,84 mld | 2020 | 19,3 mld |
| 1989 | 584 mln | 2005 | 5,5 mld | 2021 | 18 mld |
| 1990 | 756 mln | 2006 | 8,03 mld | 2022 | 18,8 mld |
| 1991 | 816 mln | 2007 | 7,99 mld | 2023 | 26,6 mld |
| 1992 | 911 mln | 2008 | 9,51 mld | 2024 | 29,2 mld |
| 1993 | 982 mln | 2009 | 9,25 mld | 2025 | 27,7 mld |
| 1994 | 1,18 mld | 2010 | 6,99 mld | 2026 | 30,8 mld |
| 1995 | 1,45 mld | 2011 | 7,49 mld | | |
Tabella dei dati
| 1980 | 15,3% | 1996 | 22,5% | 2012 | 27,1% |
| 1981 | 18,9% | 1997 | 20,7% | 2013 | 28,8% |
| 1982 | 18,1% | 1998 | 22% | 2014 | 32,7% |
| 1983 | 17% | 1999 | 25,8% | 2015 | 34,5% |
| 1984 | 17% | 2000 | 24,7% | 2016 | 34% |
| 1985 | 19% | 2001 | 25,6% | 2017 | 33,6% |
| 1986 | 18,8% | 2002 | 26,5% | 2018 | 31,6% |
| 1987 | 16,8% | 2003 | 25,9% | 2019 | 32,8% |
| 1988 | 16,7% | 2004 | 31% | 2020 | 32,2% |
| 1989 | 15,8% | 2005 | 29% | 2021 | 29,3% |
| 1990 | 18,2% | 2006 | 27,6% | 2022 | 28,9% |
| 1991 | 19,6% | 2007 | 30,4% | 2023 | 31,5% |
| 1992 | 24,7% | 2008 | 33,4% | 2024 | 33,6% |
| 1993 | 23% | 2009 | 33,9% | 2025 | 35,7% |
| 1994 | 23,4% | 2010 | 31,1% | 2026 | 38,3% |
| 1995 | 19,9% | 2011 | 25,1% | | |
Tabella dei dati
| 1980 | 117 mln | 1996 | 1,78 mld | 2012 | 10,8 mld |
| 1981 | 166 mln | 1997 | 1,86 mld | 2013 | 12,7 mld |
| 1982 | 183 mln | 1998 | 2,17 mld | 2014 | 15,5 mld |
| 1983 | 191 mln | 1999 | 2,78 mld | 2015 | 17,6 mld |
| 1984 | 210 mln | 2000 | 2,97 mld | 2016 | 19 mld |
| 1985 | 258 mln | 2001 | 3,41 mld | 2017 | 20,2 mld |
| 1986 | 291 mln | 2002 | 3,98 mld | 2018 | 19,8 mld |
| 1987 | 301 mln | 2003 | 4,26 mld | 2019 | 22 mld |
| 1988 | 355 mln | 2004 | 5,55 mld | 2020 | 22,2 mld |
| 1989 | 427 mln | 2005 | 5,83 mld | 2021 | 21,3 mld |
| 1990 | 582 mln | 2006 | 6,11 mld | 2022 | 23 mld |
| 1991 | 699 mln | 2007 | 7,42 mld | 2023 | 27,2 mld |
| 1992 | 1,03 mld | 2008 | 9,08 mld | 2024 | 30,2 mld |
| 1993 | 1,14 mld | 2009 | 10,2 mld | 2025 | 33,4 mld |
| 1994 | 1,38 mld | 2010 | 9,99 mld | 2026 | 37,5 mld |
| 1995 | 1,39 mld | 2011 | 8,85 mld | | |