Tabella dei dati
| 1980 | 46,5% | 1996 | 45,4% | 2012 | 43,8% |
| 1981 | 47,1% | 1997 | 44,1% | 2013 | 44,7% |
| 1982 | 48% | 1998 | 43,3% | 2014 | 44,6% |
| 1983 | 48,9% | 1999 | 44,6% | 2015 | 43,4% |
| 1984 | 48,3% | 2000 | 44,3% | 2016 | 44,1% |
| 1985 | 48,7% | 2001 | 43,6% | 2017 | 44,1% |
| 1986 | 48,4% | 2002 | 42,6% | 2018 | 43,9% |
| 1987 | 48,4% | 2003 | 42,6% | 2019 | 44% |
| 1988 | 47,4% | 2004 | 42,8% | 2020 | 44,1% |
| 1989 | 44,8% | 2005 | 42,9% | 2021 | 43,6% |
| 1990 | 44,7% | 2006 | 44% | 2022 | 43,3% |
| 1991 | 47,5% | 2007 | 43,1% | 2023 | 43,6% |
| 1992 | 47,1% | 2008 | 44,2% | 2024 | 43,5% |
| 1993 | 47,7% | 2009 | 43,4% | 2025 | 43,3% |
| 1994 | 45,9% | 2010 | 43,6% | 2026 | 43,5% |
| 1995 | 45,2% | 2011 | 43,4% | | |
Tabella dei dati
| 1980 | 81,2 mld | 1996 | 157 mld | 2012 | 288 mld |
| 1981 | 86,4 mld | 1997 | 163 mld | 2013 | 297 mld |
| 1982 | 91,6 mld | 1998 | 171 mld | 2014 | 302 mld |
| 1983 | 96,9 mld | 1999 | 187 mld | 2015 | 304 mld |
| 1984 | 100 mld | 2000 | 201 mld | 2016 | 318 mld |
| 1985 | 105 mld | 2001 | 211 mld | 2017 | 331 mld |
| 1986 | 108 mld | 2002 | 214 mld | 2018 | 346 mld |
| 1987 | 110 mld | 2003 | 219 mld | 2019 | 365 mld |
| 1988 | 112 mld | 2004 | 228 mld | 2020 | 360 mld |
| 1989 | 112 mld | 2005 | 237 mld | 2021 | 389 mld |
| 1990 | 119 mld | 2006 | 258 mld | 2022 | 430 mld |
| 1991 | 133 mld | 2007 | 268 mld | 2023 | 458 mld |
| 1992 | 138 mld | 2008 | 288 mld | 2024 | 488 mld |
| 1993 | 143 mld | 2009 | 273 mld | 2025 | 511 mld |
| 1994 | 145 mld | 2010 | 280 mld | 2026 | 535 mld |
| 1995 | 149 mld | 2011 | 284 mld | | |
Tabella dei dati
| 1980 | 50,6% | 1996 | 47,3% | 2012 | 47,6% |
| 1981 | 52,3% | 1997 | 45,7% | 2013 | 47,5% |
| 1982 | 53,9% | 1998 | 44,6% | 2014 | 46,7% |
| 1983 | 54,5% | 1999 | 44,3% | 2015 | 45,3% |
| 1984 | 54,5% | 2000 | 43,2% | 2016 | 43,9% |
| 1985 | 52,9% | 2001 | 44,1% | 2017 | 42,8% |
| 1986 | 52,6% | 2002 | 44,8% | 2018 | 42,4% |
| 1987 | 53,6% | 2003 | 45,8% | 2019 | 42,1% |
| 1988 | 51,7% | 2004 | 44,7% | 2020 | 47,8% |
| 1989 | 49,9% | 2005 | 43,4% | 2021 | 45,9% |
| 1990 | 48,8% | 2006 | 44% | 2022 | 43,3% |
| 1991 | 49,6% | 2007 | 43,3% | 2023 | 44% |
| 1992 | 50,2% | 2008 | 44,3% | 2024 | 44,4% |
| 1993 | 50,9% | 2009 | 48,4% | 2025 | 45,1% |
| 1994 | 49,4% | 2010 | 48,9% | 2026 | 46,2% |
| 1995 | 53,9% | 2011 | 47,8% | | |
Tabella dei dati
| 1980 | 88,5 mld | 1996 | 163 mld | 2012 | 314 mld |
| 1981 | 95,9 mld | 1997 | 169 mld | 2013 | 316 mld |
| 1982 | 103 mld | 1998 | 176 mld | 2014 | 317 mld |
| 1983 | 108 mld | 1999 | 186 mld | 2015 | 316 mld |
| 1984 | 113 mld | 2000 | 195 mld | 2016 | 316 mld |
| 1985 | 115 mld | 2001 | 213 mld | 2017 | 321 mld |
| 1986 | 118 mld | 2002 | 225 mld | 2018 | 334 mld |
| 1987 | 122 mld | 2003 | 236 mld | 2019 | 349 mld |
| 1988 | 123 mld | 2004 | 237 mld | 2020 | 390 mld |
| 1989 | 125 mld | 2005 | 240 mld | 2021 | 409 mld |
| 1990 | 130 mld | 2006 | 258 mld | 2022 | 430 mld |
| 1991 | 139 mld | 2007 | 269 mld | 2023 | 462 mld |
| 1992 | 147 mld | 2008 | 288 mld | 2024 | 499 mld |
| 1993 | 153 mld | 2009 | 305 mld | 2025 | 533 mld |
| 1994 | 156 mld | 2010 | 314 mld | 2026 | 567 mld |
| 1995 | 178 mld | 2011 | 313 mld | | |