Tabella dei dati
| 1980 | 47,3% | 1996 | 49% | 2012 | 51,9% |
| 1981 | 47,9% | 1997 | 49,5% | 2013 | 52,7% |
| 1982 | 49,2% | 1998 | 49,9% | 2014 | 52,2% |
| 1983 | 49,6% | 1999 | 49,8% | 2015 | 51,4% |
| 1984 | 50,2% | 2000 | 49,3% | 2016 | 50,9% |
| 1985 | 50,3% | 2001 | 49,6% | 2017 | 51,5% |
| 1986 | 49,6% | 2002 | 49,9% | 2018 | 51,4% |
| 1987 | 49,8% | 2003 | 49,2% | 2019 | 49,7% |
| 1988 | 48,5% | 2004 | 49,1% | 2020 | 49,4% |
| 1989 | 46,6% | 2005 | 49,1% | 2021 | 49,5% |
| 1990 | 47,4% | 2006 | 49% | 2022 | 48,9% |
| 1991 | 48% | 2007 | 48,6% | 2023 | 48,8% |
| 1992 | 47,5% | 2008 | 49,7% | 2024 | 49,7% |
| 1993 | 49,3% | 2009 | 49,1% | 2025 | 49,7% |
| 1994 | 49,4% | 2010 | 49,8% | 2026 | 49,8% |
| 1995 | 48,1% | 2011 | 50,6% | | |
Tabella dei dati
| 1980 | 42,3 mld | 1996 | 105 mld | 2012 | 201 mld |
| 1981 | 44,9 mld | 1997 | 111 mld | 2013 | 208 mld |
| 1982 | 49,9 mld | 1998 | 116 mld | 2014 | 212 mld |
| 1983 | 53,3 mld | 1999 | 121 mld | 2015 | 214 mld |
| 1984 | 58,3 mld | 2000 | 126 mld | 2016 | 218 mld |
| 1985 | 62,1 mld | 2001 | 131 mld | 2017 | 228 mld |
| 1986 | 64 mld | 2002 | 136 mld | 2018 | 236 mld |
| 1987 | 67 mld | 2003 | 138 mld | 2019 | 238 mld |
| 1988 | 69,7 mld | 2004 | 146 mld | 2020 | 229 mld |
| 1989 | 72,6 mld | 2005 | 152 mld | 2021 | 251 mld |
| 1990 | 78,3 mld | 2006 | 159 mld | 2022 | 274 mld |
| 1991 | 83,1 mld | 2007 | 167 mld | 2023 | 294 mld |
| 1992 | 86,4 mld | 2008 | 175 mld | 2024 | 308 mld |
| 1993 | 92,5 mld | 2009 | 171 mld | 2025 | 319 mld |
| 1994 | 97,5 mld | 2010 | 181 mld | 2026 | 328 mld |
| 1995 | 101 mld | 2011 | 192 mld | | |
Tabella dei dati
| 1980 | 57,1% | 1996 | 53,1% | 2012 | 56,2% |
| 1981 | 64% | 1997 | 51,6% | 2013 | 55,9% |
| 1982 | 62% | 1998 | 51% | 2014 | 55,4% |
| 1983 | 64,6% | 1999 | 50,5% | 2015 | 53,9% |
| 1984 | 61,4% | 2000 | 49,4% | 2016 | 53,4% |
| 1985 | 60,7% | 2001 | 49,4% | 2017 | 52,3% |
| 1986 | 59,9% | 2002 | 49,9% | 2018 | 52,5% |
| 1987 | 58% | 2003 | 51% | 2019 | 51,8% |
| 1988 | 56% | 2004 | 49,3% | 2020 | 58,5% |
| 1989 | 54,4% | 2005 | 51,9% | 2021 | 54,9% |
| 1990 | 54,4% | 2006 | 48,8% | 2022 | 52,5% |
| 1991 | 55,6% | 2007 | 48,6% | 2023 | 52,8% |
| 1992 | 55,9% | 2008 | 50,8% | 2024 | 54,1% |
| 1993 | 57,1% | 2009 | 54,5% | 2025 | 55% |
| 1994 | 54,7% | 2010 | 53,9% | 2026 | 54,9% |
| 1995 | 52,6% | 2011 | 55% | | |
Tabella dei dati
| 1980 | 51 mld | 1996 | 114 mld | 2012 | 218 mld |
| 1981 | 59,9 mld | 1997 | 116 mld | 2013 | 221 mld |
| 1982 | 62,8 mld | 1998 | 119 mld | 2014 | 224 mld |
| 1983 | 69,4 mld | 1999 | 122 mld | 2015 | 224 mld |
| 1984 | 71,3 mld | 2000 | 127 mld | 2016 | 229 mld |
| 1985 | 74,9 mld | 2001 | 131 mld | 2017 | 232 mld |
| 1986 | 77,3 mld | 2002 | 136 mld | 2018 | 241 mld |
| 1987 | 77,9 mld | 2003 | 144 mld | 2019 | 248 mld |
| 1988 | 80,5 mld | 2004 | 146 mld | 2020 | 271 mld |
| 1989 | 84,8 mld | 2005 | 161 mld | 2021 | 278 mld |
| 1990 | 89,9 mld | 2006 | 159 mld | 2022 | 295 mld |
| 1991 | 96,4 mld | 2007 | 167 mld | 2023 | 318 mld |
| 1992 | 102 mld | 2008 | 179 mld | 2024 | 335 mld |
| 1993 | 107 mld | 2009 | 190 mld | 2025 | 353 mld |
| 1994 | 108 mld | 2010 | 196 mld | 2026 | 362 mld |
| 1995 | 111 mld | 2011 | 208 mld | | |