Tabella dei dati
| 1980 | 43,6% | 1996 | 71,2% | 2012 | 65,7% |
| 1981 | 46,9% | 1997 | 65,7% | 2013 | 67,2% |
| 1982 | 52,4% | 1998 | 62,7% | 2014 | 67,2% |
| 1983 | 58,4% | 1999 | 58,6% | 2015 | 63,8% |
| 1984 | 61,9% | 2000 | 52,2% | 2016 | 60,9% |
| 1985 | 67,1% | 2001 | 49,4% | 2017 | 56% |
| 1986 | 68,9% | 2002 | 48,7% | 2018 | 51,6% |
| 1987 | 71,3% | 2003 | 49,8% | 2019 | 47,7% |
| 1988 | 73,7% | 2004 | 50,1% | 2020 | 53,4% |
| 1989 | 73,7% | 2005 | 49,6% | 2021 | 50,5% |
| 1990 | 75% | 2006 | 45% | 2022 | 48,4% |
| 1991 | 74,8% | 2007 | 42,7% | 2023 | 45,9% |
| 1992 | 75,6% | 2008 | 54,4% | 2024 | 43,7% |
| 1993 | 76,7% | 2009 | 56,3% | 2025 | 43,3% |
| 1994 | 73,5% | 2010 | 58,9% | 2026 | 44,1% |
| 1995 | 73% | 2011 | 61,2% | | |
Tabella dei dati
| 1980 | 76,1 mld | 1996 | 246 mld | 2012 | 432 mld |
| 1981 | 85,9 mld | 1997 | 243 mld | 2013 | 447 mld |
| 1982 | 100 mld | 1998 | 247 mld | 2014 | 456 mld |
| 1983 | 116 mld | 1999 | 246 mld | 2015 | 446 mld |
| 1984 | 128 mld | 2000 | 236 mld | 2016 | 438 mld |
| 1985 | 145 mld | 2001 | 239 mld | 2017 | 420 mld |
| 1986 | 154 mld | 2002 | 245 mld | 2018 | 406 mld |
| 1987 | 162 mld | 2003 | 256 mld | 2019 | 395 mld |
| 1988 | 175 mld | 2004 | 266 mld | 2020 | 436 mld |
| 1989 | 185 mld | 2005 | 274 mld | 2021 | 450 mld |
| 1990 | 199 mld | 2006 | 264 mld | 2022 | 481 mld |
| 1991 | 210 mld | 2007 | 266 mld | 2023 | 481 mld |
| 1992 | 221 mld | 2008 | 354 mld | 2024 | 491 mld |
| 1993 | 230 mld | 2009 | 355 mld | 2025 | 511 mld |
| 1994 | 232 mld | 2010 | 379 mld | 2026 | 543 mld |
| 1995 | 241 mld | 2011 | 401 mld | | |
Tabella dei dati
| 1995 | 55,8% | 2006 | 37,2% | 2017 | 46,1% |
| 1996 | 54,9% | 2007 | 34,4% | 2018 | 42,5% |
| 1997 | 51,7% | 2008 | 39,8% | 2019 | 39,3% |
| 1998 | 49% | 2009 | 42,3% | 2020 | 44% |
| 1999 | 45,8% | 2010 | 46,1% | 2021 | 41,6% |
| 2000 | 40,3% | 2011 | 48,7% | 2022 | 39,9% |
| 2001 | 38,9% | 2012 | 52,3% | 2023 | 37,8% |
| 2002 | 39,1% | 2013 | 54% | 2024 | 36% |
| 2003 | 40,8% | 2014 | 54,9% | 2025 | 35,7% |
| 2004 | 41,5% | 2015 | 53% | 2026 | 36,4% |
| 2005 | 39,9% | 2016 | 51% | | |
Tabella dei dati
| 1995 | 184 mld | 2006 | 219 mld | 2017 | 346 mld |
| 1996 | 189 mld | 2007 | 214 mld | 2018 | 334 mld |
| 1997 | 191 mld | 2008 | 259 mld | 2019 | 326 mld |
| 1998 | 193 mld | 2009 | 267 mld | 2020 | 359 mld |
| 1999 | 192 mld | 2010 | 297 mld | 2021 | 371 mld |
| 2000 | 182 mld | 2011 | 319 mld | 2022 | 396 mld |
| 2001 | 188 mld | 2012 | 344 mld | 2023 | 397 mld |
| 2002 | 197 mld | 2013 | 359 mld | 2024 | 405 mld |
| 2003 | 210 mld | 2014 | 373 mld | 2025 | 421 mld |
| 2004 | 221 mld | 2015 | 370 mld | 2026 | 447 mld |
| 2005 | 221 mld | 2016 | 368 mld | | |