Tabella dei dati
| 1980 | 54,2% | 1996 | 56,9% | 2012 | 49,1% |
| 1981 | 57,7% | 1997 | 56,3% | 2013 | 49,7% |
| 1982 | 57,8% | 1998 | 56,4% | 2014 | 48,9% |
| 1983 | 58,9% | 1999 | 55,8% | 2015 | 49,1% |
| 1984 | 58,3% | 2000 | 55,3% | 2016 | 50,4% |
| 1985 | 58,8% | 2001 | 53,1% | 2017 | 50,5% |
| 1986 | 60,2% | 2002 | 51,2% | 2018 | 50,4% |
| 1987 | 61,6% | 2003 | 51,7% | 2019 | 49,2% |
| 1988 | 60,2% | 2004 | 51,8% | 2020 | 48,8% |
| 1989 | 60,2% | 2005 | 53,3% | 2021 | 49,2% |
| 1990 | 61,2% | 2006 | 52,3% | 2022 | 49,3% |
| 1991 | 61,5% | 2007 | 51,8% | 2023 | 48,3% |
| 1992 | 58% | 2008 | 51,3% | 2024 | 47,8% |
| 1993 | 57,1% | 2009 | 50,8% | 2025 | 48% |
| 1994 | 56,5% | 2010 | 49,6% | 2026 | 47% |
| 1995 | 55,1% | 2011 | 48,7% | | |
Tabella dei dati
| 1980 | 321 mld | 1996 | 1,11 mila mld | 2012 | 1,83 mila mld |
| 1981 | 374 mld | 1997 | 1,15 mila mld | 2013 | 1,89 mila mld |
| 1982 | 410 mld | 1998 | 1,22 mila mld | 2014 | 1,94 mila mld |
| 1983 | 468 mld | 1999 | 1,27 mila mld | 2015 | 2,08 mila mld |
| 1984 | 521 mld | 2000 | 1,33 mila mld | 2016 | 2,21 mila mld |
| 1985 | 572 mld | 2001 | 1,33 mila mld | 2017 | 2,31 mila mld |
| 1986 | 641 mld | 2002 | 1,33 mila mld | 2018 | 2,41 mila mld |
| 1987 | 710 mld | 2003 | 1,4 mila mld | 2019 | 2,47 mila mld |
| 1988 | 759 mld | 2004 | 1,47 mila mld | 2020 | 2,45 mila mld |
| 1989 | 840 mld | 2005 | 1,56 mila mld | 2021 | 2,66 mila mld |
| 1990 | 940 mld | 2006 | 1,63 mila mld | 2022 | 2,87 mila mld |
| 1991 | 1,01 mila mld | 2007 | 1,72 mila mld | 2023 | 2,97 mila mld |
| 1992 | 954 mld | 2008 | 1,74 mila mld | 2024 | 3,06 mila mld |
| 1993 | 944 mld | 2009 | 1,69 mila mld | 2025 | 3,15 mila mld |
| 1994 | 997 mld | 2010 | 1,76 mila mld | 2026 | 3,22 mila mld |
| 1995 | 1,05 mila mld | 2011 | 1,8 mila mld | | |
Tabella dei dati
| 1980 | 59,5% | 1996 | 60% | 2012 | 50,2% |
| 1981 | 62,1% | 1997 | 57,9% | 2013 | 51,4% |
| 1982 | 64% | 1998 | 55,6% | 2014 | 50,7% |
| 1983 | 63,7% | 1999 | 55,2% | 2015 | 49,4% |
| 1984 | 61% | 2000 | 52,2% | 2016 | 49,5% |
| 1985 | 62,1% | 2001 | 51,7% | 2017 | 49,2% |
| 1986 | 60,2% | 2002 | 52,7% | 2018 | 49,8% |
| 1987 | 58% | 2003 | 53% | 2019 | 48,8% |
| 1988 | 56,6% | 2004 | 51,7% | 2020 | 52% |
| 1989 | 56,6% | 2005 | 51,2% | 2021 | 49,3% |
| 1990 | 57,5% | 2006 | 50,1% | 2022 | 48,3% |
| 1991 | 61,2% | 2007 | 48,5% | 2023 | 48,9% |
| 1992 | 66,5% | 2008 | 49,4% | 2024 | 49,3% |
| 1993 | 67,9% | 2009 | 51,7% | 2025 | 49,4% |
| 1994 | 65,3% | 2010 | 49,7% | 2026 | 49,4% |
| 1995 | 62,1% | 2011 | 49,1% | | |
Tabella dei dati
| 1980 | 353 mld | 1996 | 1,18 mila mld | 2012 | 1,87 mila mld |
| 1981 | 402 mld | 1997 | 1,19 mila mld | 2013 | 1,95 mila mld |
| 1982 | 454 mld | 1998 | 1,2 mila mld | 2014 | 2,01 mila mld |
| 1983 | 506 mld | 1999 | 1,25 mila mld | 2015 | 2,09 mila mld |
| 1984 | 545 mld | 2000 | 1,26 mila mld | 2016 | 2,18 mila mld |
| 1985 | 604 mld | 2001 | 1,3 mila mld | 2017 | 2,25 mila mld |
| 1986 | 641 mld | 2002 | 1,37 mila mld | 2018 | 2,38 mila mld |
| 1987 | 668 mld | 2003 | 1,43 mila mld | 2019 | 2,45 mila mld |
| 1988 | 713 mld | 2004 | 1,46 mila mld | 2020 | 2,61 mila mld |
| 1989 | 791 mld | 2005 | 1,5 mila mld | 2021 | 2,67 mila mld |
| 1990 | 883 mld | 2006 | 1,56 mila mld | 2022 | 2,81 mila mld |
| 1991 | 1,01 mila mld | 2007 | 1,61 mila mld | 2023 | 3 mila mld |
| 1992 | 1,09 mila mld | 2008 | 1,68 mila mld | 2024 | 3,15 mila mld |
| 1993 | 1,12 mila mld | 2009 | 1,72 mila mld | 2025 | 3,25 mila mld |
| 1994 | 1,15 mila mld | 2010 | 1,77 mila mld | 2026 | 3,39 mila mld |
| 1995 | 1,18 mila mld | 2011 | 1,82 mila mld | | |