Tabella dei dati
| 1980 | 28,2% | 1996 | 37% | 2012 | 37,7% |
| 1981 | 28,9% | 1997 | 37,6% | 2013 | 38,7% |
| 1982 | 29,4% | 1998 | 38,4% | 2014 | 39% |
| 1983 | 31,2% | 1999 | 38,7% | 2015 | 38,4% |
| 1984 | 31,3% | 2000 | 38% | 2016 | 37,9% |
| 1985 | 33% | 2001 | 38% | 2017 | 38% |
| 1986 | 33,6% | 2002 | 38,3% | 2018 | 38,9% |
| 1987 | 35,3% | 2003 | 38% | 2019 | 39% |
| 1988 | 35,3% | 2004 | 38,7% | 2020 | 41,4% |
| 1989 | 37,1% | 2005 | 39,7% | 2021 | 42,8% |
| 1990 | 37,2% | 2006 | 40,5% | 2022 | 41,7% |
| 1991 | 38% | 2007 | 41,1% | 2023 | 42,1% |
| 1992 | 39,6% | 2008 | 36,8% | 2024 | 42,3% |
| 1993 | 39,4% | 2009 | 34,8% | 2025 | 42,2% |
| 1994 | 38,5% | 2010 | 36,4% | 2026 | 43,2% |
| 1995 | 37,3% | 2011 | 36,2% | | |
Tabella dei dati
| 1980 | 28 mld | 1996 | 181 mld | 2012 | 391 mld |
| 1981 | 32,8 mld | 1997 | 195 mld | 2013 | 397 mld |
| 1982 | 38,2 mld | 1998 | 213 mld | 2014 | 405 mld |
| 1983 | 46,3 mld | 1999 | 230 mld | 2015 | 418 mld |
| 1984 | 52,1 mld | 2000 | 246 mld | 2016 | 425 mld |
| 1985 | 61,2 mld | 2001 | 266 mld | 2017 | 444 mld |
| 1986 | 71,1 mld | 2002 | 287 mld | 2018 | 472 mld |
| 1987 | 83,2 mld | 2003 | 305 mld | 2019 | 489 mld |
| 1988 | 92,4 mld | 2004 | 333 mld | 2020 | 468 mld |
| 1989 | 109 mld | 2005 | 368 mld | 2021 | 529 mld |
| 1990 | 122 mld | 2006 | 407 mld | 2022 | 574 mld |
| 1991 | 137 mld | 2007 | 442 mld | 2023 | 630 mld |
| 1992 | 153 mld | 2008 | 409 mld | 2024 | 674 mld |
| 1993 | 159 mld | 2009 | 374 mld | 2025 | 711 mld |
| 1994 | 165 mld | 2010 | 392 mld | 2026 | 767 mld |
| 1995 | 172 mld | 2011 | 387 mld | | |
Tabella dei dati
| 1980 | 30,2% | 1996 | 42,9% | 2012 | 49,2% |
| 1981 | 31,3% | 1997 | 41,5% | 2013 | 46,2% |
| 1982 | 34,9% | 1998 | 41% | 2014 | 45,1% |
| 1983 | 35,9% | 1999 | 40% | 2015 | 43,7% |
| 1984 | 36,7% | 2000 | 39,1% | 2016 | 42,1% |
| 1985 | 39,8% | 2001 | 38,4% | 2017 | 41% |
| 1986 | 39,6% | 2002 | 38,6% | 2018 | 41,5% |
| 1987 | 38,5% | 2003 | 38,4% | 2019 | 42% |
| 1988 | 38,7% | 2004 | 38,8% | 2020 | 51,4% |
| 1989 | 40,1% | 2005 | 38,4% | 2021 | 49,5% |
| 1990 | 41,1% | 2006 | 38,4% | 2022 | 46,3% |
| 1991 | 42,6% | 2007 | 39,2% | 2023 | 45,4% |
| 1992 | 43,9% | 2008 | 41,3% | 2024 | 45,5% |
| 1993 | 46,3% | 2009 | 46,1% | 2025 | 44,7% |
| 1994 | 44,8% | 2010 | 45,8% | 2026 | 45,3% |
| 1995 | 44,1% | 2011 | 45,9% | | |
Tabella dei dati
| 1980 | 30 mld | 1996 | 210 mld | 2012 | 510 mld |
| 1981 | 35,5 mld | 1997 | 215 mld | 2013 | 473 mld |
| 1982 | 45,3 mld | 1998 | 228 mld | 2014 | 468 mld |
| 1983 | 53,3 mld | 1999 | 238 mld | 2015 | 475 mld |
| 1984 | 61,1 mld | 2000 | 253 mld | 2016 | 473 mld |
| 1985 | 73,8 mld | 2001 | 269 mld | 2017 | 480 mld |
| 1986 | 83,7 mld | 2002 | 290 mld | 2018 | 503 mld |
| 1987 | 90,9 mld | 2003 | 308 mld | 2019 | 527 mld |
| 1988 | 101 mld | 2004 | 334 mld | 2020 | 581 mld |
| 1989 | 118 mld | 2005 | 357 mld | 2021 | 611 mld |
| 1990 | 134 mld | 2006 | 386 mld | 2022 | 637 mld |
| 1991 | 153 mld | 2007 | 422 mld | 2023 | 680 mld |
| 1992 | 170 mld | 2008 | 460 mld | 2024 | 725 mld |
| 1993 | 187 mld | 2009 | 494 mld | 2025 | 753 mld |
| 1994 | 192 mld | 2010 | 494 mld | 2026 | 803 mld |
| 1995 | 203 mld | 2011 | 491 mld | | |