Tabella dei dati
| 1980 | 36,2% | 1996 | 31,9% | 2012 | 35,4% |
| 1981 | 37,6% | 1997 | 32,7% | 2013 | 36,3% |
| 1982 | 38,5% | 1998 | 34,1% | 2014 | 35,4% |
| 1983 | 37,2% | 1999 | 34,5% | 2015 | 35,6% |
| 1984 | 37,1% | 2000 | 35,2% | 2016 | 36% |
| 1985 | 36,9% | 2001 | 34,8% | 2017 | 36,4% |
| 1986 | 35,9% | 2002 | 33,9% | 2018 | 36,2% |
| 1987 | 34,7% | 2003 | 33,8% | 2019 | 35,9% |
| 1988 | 34,4% | 2004 | 34,7% | 2020 | 36,4% |
| 1989 | 34,1% | 2005 | 35,1% | 2021 | 37,4% |
| 1990 | 33,4% | 2006 | 35,4% | 2022 | 38,6% |
| 1991 | 33% | 2007 | 35,8% | 2023 | 38,1% |
| 1992 | 32,3% | 2008 | 35,6% | 2024 | 37,6% |
| 1993 | 31% | 2009 | 34,2% | 2025 | 38,3% |
| 1994 | 31,6% | 2010 | 35,2% | 2026 | 40% |
| 1995 | 32,5% | 2011 | 35,9% | | |
Tabella dei dati
| 1980 | 94,1 mld | 1996 | 292 mld | 2012 | 609 mld |
| 1981 | 109 mld | 1997 | 313 mld | 2013 | 649 mld |
| 1982 | 123 mld | 1998 | 341 mld | 2014 | 663 mld |
| 1983 | 131 mld | 1999 | 361 mld | 2015 | 685 mld |
| 1984 | 140 mld | 2000 | 388 mld | 2016 | 722 mld |
| 1985 | 153 mld | 2001 | 401 mld | 2017 | 762 mld |
| 1986 | 161 mld | 2002 | 404 mld | 2018 | 787 mld |
| 1987 | 173 mld | 2003 | 427 mld | 2019 | 810 mld |
| 1988 | 192 mld | 2004 | 461 mld | 2020 | 773 mld |
| 1989 | 210 mld | 2005 | 493 mld | 2021 | 868 mld |
| 1990 | 225 mld | 2006 | 524 mld | 2022 | 997 mld |
| 1991 | 234 mld | 2007 | 555 mld | 2023 | 1,05 mila mld |
| 1992 | 237 mld | 2008 | 570 mld | 2024 | 1,09 mila mld |
| 1993 | 240 mld | 2009 | 533 mld | 2025 | 1,16 mila mld |
| 1994 | 257 mld | 2010 | 569 mld | 2026 | 1,25 mila mld |
| 1995 | 278 mld | 2011 | 599 mld | | |
Tabella dei dati
| 1980 | 39% | 1996 | 35,6% | 2012 | 43,3% |
| 1981 | 41,3% | 1997 | 34,7% | 2013 | 41,6% |
| 1982 | 40,8% | 1998 | 34,3% | 2014 | 40,8% |
| 1983 | 40,1% | 1999 | 33,7% | 2015 | 40,1% |
| 1984 | 40,2% | 2000 | 33,8% | 2016 | 39,3% |
| 1985 | 39,4% | 2001 | 34,5% | 2017 | 38,8% |
| 1986 | 38,2% | 2002 | 35,8% | 2018 | 38,5% |
| 1987 | 36,4% | 2003 | 37% | 2019 | 38,3% |
| 1988 | 34,2% | 2004 | 37,9% | 2020 | 49,3% |
| 1989 | 33,6% | 2005 | 38,3% | 2021 | 44,9% |
| 1990 | 34,9% | 2006 | 38,2% | 2022 | 43,2% |
| 1991 | 35,7% | 2007 | 38,4% | 2023 | 44,2% |
| 1992 | 37,7% | 2008 | 40,6% | 2024 | 43,7% |
| 1993 | 37,6% | 2009 | 44,2% | 2025 | 43,6% |
| 1994 | 37,4% | 2010 | 44,5% | 2026 | 43,9% |
| 1995 | 37,5% | 2011 | 43,3% | | |
Tabella dei dati
| 1980 | 101 mld | 1996 | 325 mld | 2012 | 746 mld |
| 1981 | 120 mld | 1997 | 332 mld | 2013 | 744 mld |
| 1982 | 131 mld | 1998 | 344 mld | 2014 | 766 mld |
| 1983 | 141 mld | 1999 | 353 mld | 2015 | 773 mld |
| 1984 | 152 mld | 2000 | 373 mld | 2016 | 788 mld |
| 1985 | 163 mld | 2001 | 397 mld | 2017 | 815 mld |
| 1986 | 171 mld | 2002 | 428 mld | 2018 | 835 mld |
| 1987 | 181 mld | 2003 | 467 mld | 2019 | 863 mld |
| 1988 | 190 mld | 2004 | 502 mld | 2020 | 1,05 mila mld |
| 1989 | 207 mld | 2005 | 537 mld | 2021 | 1,04 mila mld |
| 1990 | 235 mld | 2006 | 564 mld | 2022 | 1,12 mila mld |
| 1991 | 253 mld | 2007 | 596 mld | 2023 | 1,22 mila mld |
| 1992 | 276 mld | 2008 | 651 mld | 2024 | 1,26 mila mld |
| 1993 | 291 mld | 2009 | 689 mld | 2025 | 1,33 mila mld |
| 1994 | 304 mld | 2010 | 719 mld | 2026 | 1,38 mila mld |
| 1995 | 320 mld | 2011 | 723 mld | | |