Tabella dei dati
| 1980 | 49% | 1996 | 55,8% | 2012 | 54,7% |
| 1981 | 49,2% | 1997 | 55% | 2013 | 54,6% |
| 1982 | 47,9% | 1998 | 55,3% | 2014 | 56,5% |
| 1983 | 50,7% | 1999 | 55,7% | 2015 | 53,5% |
| 1984 | 51,3% | 2000 | 54,7% | 2016 | 52,7% |
| 1985 | 53,1% | 2001 | 54,1% | 2017 | 52,3% |
| 1986 | 53,1% | 2002 | 53,3% | 2018 | 51,6% |
| 1987 | 54,7% | 2003 | 53,6% | 2019 | 54,1% |
| 1988 | 55,1% | 2004 | 55% | 2020 | 53,7% |
| 1989 | 54% | 2005 | 56,3% | 2021 | 53,8% |
| 1990 | 53,3% | 2006 | 55% | 2022 | 48,5% |
| 1991 | 52,3% | 2007 | 54,8% | 2023 | 50,8% |
| 1992 | 53,8% | 2008 | 53,7% | 2024 | 51,8% |
| 1993 | 55,7% | 2009 | 53,6% | 2025 | 50,5% |
| 1994 | 55,6% | 2010 | 54% | 2026 | 49,1% |
| 1995 | 55,2% | 2011 | 54,5% | | |
Tabella dei dati
| 1980 | 196 mld | 1996 | 607 mld | 2012 | 1,04 mila mld |
| 1981 | 216 mld | 1997 | 629 mld | 2013 | 1,06 mila mld |
| 1982 | 240 mld | 1998 | 656 mld | 2014 | 1,12 mila mld |
| 1983 | 280 mld | 1999 | 692 mld | 2015 | 1,09 mila mld |
| 1984 | 312 mld | 2000 | 725 mld | 2016 | 1,11 mila mld |
| 1985 | 352 mld | 2001 | 743 mld | 2017 | 1,14 mila mld |
| 1986 | 377 mld | 2002 | 753 mld | 2018 | 1,16 mila mld |
| 1987 | 408 mld | 2003 | 772 mld | 2019 | 1,25 mila mld |
| 1988 | 429 mld | 2004 | 831 mld | 2020 | 1,25 mila mld |
| 1989 | 443 mld | 2005 | 895 mld | 2021 | 1,37 mila mld |
| 1990 | 456 mld | 2006 | 927 mld | 2022 | 1,37 mila mld |
| 1991 | 466 mld | 2007 | 955 mld | 2023 | 1,42 mila mld |
| 1992 | 497 mld | 2008 | 973 mld | 2024 | 1,52 mila mld |
| 1993 | 517 mld | 2009 | 927 mld | 2025 | 1,54 mila mld |
| 1994 | 552 mld | 2010 | 979 mld | 2026 | 1,56 mila mld |
| 1995 | 572 mld | 2011 | 1,01 mila mld | | |
Tabella dei dati
| 1980 | 52,7% | 1996 | 58,2% | 2012 | 57,9% |
| 1981 | 56% | 1997 | 56,2% | 2013 | 55,6% |
| 1982 | 57,1% | 1998 | 55,6% | 2014 | 55,1% |
| 1983 | 57,2% | 1999 | 54,7% | 2015 | 54,4% |
| 1984 | 55,7% | 2000 | 52,9% | 2016 | 52,4% |
| 1985 | 54,7% | 2001 | 53% | 2017 | 50,6% |
| 1986 | 51,8% | 2002 | 53,1% | 2018 | 50,8% |
| 1987 | 53,3% | 2003 | 53,5% | 2019 | 49,8% |
| 1988 | 55,2% | 2004 | 52,8% | 2020 | 53,3% |
| 1989 | 55,3% | 2005 | 51,1% | 2021 | 49,7% |
| 1990 | 55,1% | 2006 | 49,7% | 2022 | 45,1% |
| 1991 | 55,5% | 2007 | 49,5% | 2023 | 47,4% |
| 1992 | 56,4% | 2008 | 50,3% | 2024 | 47,3% |
| 1993 | 59,5% | 2009 | 56,3% | 2025 | 47,6% |
| 1994 | 59,5% | 2010 | 56,5% | 2026 | 48,9% |
| 1995 | 58,7% | 2011 | 56,3% | | |
Tabella dei dati
| 1980 | 210 mld | 1996 | 633 mld | 2012 | 1,1 mila mld |
| 1981 | 245 mld | 1997 | 643 mld | 2013 | 1,08 mila mld |
| 1982 | 286 mld | 1998 | 659 mld | 2014 | 1,09 mila mld |
| 1983 | 316 mld | 1999 | 678 mld | 2015 | 1,1 mila mld |
| 1984 | 339 mld | 2000 | 701 mld | 2016 | 1,1 mila mld |
| 1985 | 362 mld | 2001 | 727 mld | 2017 | 1,11 mila mld |
| 1986 | 368 mld | 2002 | 749 mld | 2018 | 1,14 mila mld |
| 1987 | 398 mld | 2003 | 770 mld | 2019 | 1,15 mila mld |
| 1988 | 430 mld | 2004 | 797 mld | 2020 | 1,24 mila mld |
| 1989 | 454 mld | 2005 | 812 mld | 2021 | 1,27 mila mld |
| 1990 | 471 mld | 2006 | 838 mld | 2022 | 1,28 mila mld |
| 1991 | 494 mld | 2007 | 862 mld | 2023 | 1,32 mila mld |
| 1992 | 521 mld | 2008 | 910 mld | 2024 | 1,39 mila mld |
| 1993 | 552 mld | 2009 | 974 mld | 2025 | 1,46 mila mld |
| 1994 | 590 mld | 2010 | 1,02 mila mld | 2026 | 1,56 mila mld |
| 1995 | 608 mld | 2011 | 1,04 mila mld | | |