Tabella dei dati
| 1983 | 44,8% | 1998 | 44% | 2013 | 38,2% |
| 1984 | 44,4% | 1999 | 45,9% | 2014 | 36,3% |
| 1985 | 48,2% | 2000 | 40,7% | 2015 | 32,9% |
| 1986 | 48% | 2001 | 37,9% | 2016 | 34,5% |
| 1987 | 52,5% | 2002 | 40,1% | 2017 | 32,6% |
| 1988 | 58,6% | 2003 | 48% | 2018 | 32,2% |
| 1989 | 59,9% | 2004 | 40,3% | 2019 | 32,2% |
| 1990 | 58% | 2005 | 39,4% | 2020 | 31% |
| 1991 | 55,3% | 2006 | 41% | 2021 | 33,1% |
| 1992 | 57,2% | 2007 | 32% | 2022 | 30,8% |
| 1993 | 56,7% | 2008 | 34,9% | 2023 | 32% |
| 1994 | 56,7% | 2009 | 37% | 2024 | 32,3% |
| 1995 | 50,5% | 2010 | 35,1% | 2025 | 31,7% |
| 1996 | 49,4% | 2011 | 39,8% | 2026 | 33,3% |
| 1997 | 48,8% | 2012 | 41,5% | | |
Tabella dei dati
| 1983 | 445 mln | 1998 | 1,41 mld | 2013 | 6,11 mld |
| 1984 | 475 mln | 1999 | 1,53 mld | 2014 | 6,41 mld |
| 1985 | 581 mln | 2000 | 1,43 mld | 2015 | 6,28 mld |
| 1986 | 616 mln | 2001 | 1,38 mld | 2016 | 7,21 mld |
| 1987 | 733 mln | 2002 | 1,53 mld | 2017 | 7,45 mld |
| 1988 | 895 mln | 2003 | 1,83 mld | 2018 | 8 mld |
| 1989 | 1,03 mld | 2004 | 1,86 mld | 2019 | 8,44 mld |
| 1990 | 1,14 mld | 2005 | 1,99 mld | 2020 | 7,54 mld |
| 1991 | 1,09 mld | 2006 | 2,3 mld | 2021 | 8,32 mld |
| 1992 | 1,27 mld | 2007 | 2,21 mld | 2022 | 8,8 mld |
| 1993 | 1,39 mld | 2008 | 3,19 mld | 2023 | 9,73 mld |
| 1994 | 1,4 mld | 2009 | 4,26 mld | 2024 | 10,5 mld |
| 1995 | 1,22 mld | 2010 | 4,11 mld | 2025 | 10,8 mld |
| 1996 | 1,24 mld | 2011 | 5,01 mld | 2026 | 11,8 mld |
| 1997 | 1,38 mld | 2012 | 6,02 mld | | |
Tabella dei dati
| 1983 | 47,9% | 1998 | 60,7% | 2013 | 37,8% |
| 1984 | 50,5% | 1999 | 56,1% | 2014 | 33,4% |
| 1985 | 53% | 2000 | 55,4% | 2015 | 31,5% |
| 1986 | 58% | 2001 | 46,8% | 2016 | 34,5% |
| 1987 | 49,7% | 2002 | 56,3% | 2017 | 34,3% |
| 1988 | 46,7% | 2003 | 44,6% | 2018 | 33% |
| 1989 | 51,7% | 2004 | 39,9% | 2019 | 31,7% |
| 1990 | 46,1% | 2005 | 39% | 2020 | 46,7% |
| 1991 | 52,1% | 2006 | 43,6% | 2021 | 38,8% |
| 1992 | 50,7% | 2007 | 41,9% | 2022 | 31,6% |
| 1993 | 60,4% | 2008 | 27% | 2023 | 33,1% |
| 1994 | 63,6% | 2009 | 32,1% | 2024 | 33% |
| 1995 | 53,1% | 2010 | 34,6% | 2025 | 32,7% |
| 1996 | 59,1% | 2011 | 36,4% | 2026 | 35,3% |
| 1997 | 54,7% | 2012 | 38,6% | | |
Tabella dei dati
| 1983 | 476 mln | 1998 | 1,94 mld | 2013 | 6,06 mld |
| 1984 | 540 mln | 1999 | 1,87 mld | 2014 | 5,9 mld |
| 1985 | 639 mln | 2000 | 1,95 mld | 2015 | 6,01 mld |
| 1986 | 745 mln | 2001 | 1,71 mld | 2016 | 7,2 mld |
| 1987 | 694 mln | 2002 | 2,15 mld | 2017 | 7,83 mld |
| 1988 | 714 mln | 2003 | 1,7 mld | 2018 | 8,2 mld |
| 1989 | 889 mln | 2004 | 1,84 mld | 2019 | 8,32 mld |
| 1990 | 906 mln | 2005 | 1,97 mld | 2020 | 11,4 mld |
| 1991 | 1,03 mld | 2006 | 2,44 mld | 2021 | 9,77 mld |
| 1992 | 1,13 mld | 2007 | 2,9 mld | 2022 | 9,02 mld |
| 1993 | 1,48 mld | 2008 | 2,47 mld | 2023 | 10,1 mld |
| 1994 | 1,57 mld | 2009 | 3,7 mld | 2024 | 10,7 mld |
| 1995 | 1,29 mld | 2010 | 4,05 mld | 2025 | 11,2 mld |
| 1996 | 1,48 mld | 2011 | 4,59 mld | 2026 | 12,5 mld |
| 1997 | 1,55 mld | 2012 | 5,6 mld | | |