Tabella dei dati
| 1980 | 46,7% | 1996 | 55,1% | 2012 | 53,5% |
| 1981 | 49,3% | 1997 | 53,6% | 2013 | 54,6% |
| 1982 | 48,8% | 1998 | 52,9% | 2014 | 54,6% |
| 1983 | 48,6% | 1999 | 51,5% | 2015 | 53,3% |
| 1984 | 50,2% | 2000 | 53,7% | 2016 | 53,4% |
| 1985 | 52% | 2001 | 51,1% | 2017 | 52,2% |
| 1986 | 53,4% | 2002 | 51,4% | 2018 | 51,8% |
| 1987 | 51,7% | 2003 | 50,6% | 2019 | 51,7% |
| 1988 | 54,4% | 2004 | 50,3% | 2020 | 50,9% |
| 1989 | 53,9% | 2005 | 51,8% | 2021 | 52,5% |
| 1990 | 53,7% | 2006 | 52,2% | 2022 | 52,5% |
| 1991 | 56,1% | 2007 | 51,8% | 2023 | 53,1% |
| 1992 | 55,9% | 2008 | 52,1% | 2024 | 53,4% |
| 1993 | 55,6% | 2009 | 51,6% | 2025 | 53,7% |
| 1994 | 55,8% | 2010 | 51,4% | 2026 | 53,9% |
| 1995 | 54,1% | 2011 | 52,8% | | |
Tabella dei dati
| 1980 | 15,7 mld | 1996 | 56,2 mld | 2012 | 107 mld |
| 1981 | 18,8 mld | 1997 | 59,4 mld | 2013 | 111 mld |
| 1982 | 20,9 mld | 1998 | 63,7 mld | 2014 | 112 mld |
| 1983 | 23,2 mld | 1999 | 65,4 mld | 2015 | 112 mld |
| 1984 | 26,8 mld | 2000 | 73,2 mld | 2016 | 115 mld |
| 1985 | 30,3 mld | 2001 | 73,9 mld | 2017 | 117 mld |
| 1986 | 33,5 mld | 2002 | 76,3 mld | 2018 | 120 mld |
| 1987 | 35 mld | 2003 | 76,8 mld | 2019 | 123 mld |
| 1988 | 41,8 mld | 2004 | 79,9 mld | 2020 | 120 mld |
| 1989 | 46,3 mld | 2005 | 85,3 mld | 2021 | 131 mld |
| 1990 | 48,9 mld | 2006 | 90,2 mld | 2022 | 140 mld |
| 1991 | 48,7 mld | 2007 | 96,9 mld | 2023 | 145 mld |
| 1992 | 47,4 mld | 2008 | 101 mld | 2024 | 147 mld |
| 1993 | 47,6 mld | 2009 | 93,8 mld | 2025 | 151 mld |
| 1994 | 50,6 mld | 2010 | 96,8 mld | 2026 | 154 mld |
| 1995 | 53,2 mld | 2011 | 104 mld | | |
Tabella dei dati
| 1980 | 43,9% | 1996 | 58,5% | 2012 | 55,7% |
| 1981 | 44,5% | 1997 | 54,9% | 2013 | 57,1% |
| 1982 | 46,4% | 1998 | 51,3% | 2014 | 57,6% |
| 1983 | 48,2% | 1999 | 49,9% | 2015 | 55,7% |
| 1984 | 47,5% | 2000 | 46,9% | 2016 | 55,1% |
| 1985 | 49,4% | 2001 | 46,2% | 2017 | 52,9% |
| 1986 | 50% | 2002 | 47,5% | 2018 | 52,7% |
| 1987 | 51% | 2003 | 48,3% | 2019 | 52,6% |
| 1988 | 49,5% | 2004 | 48,2% | 2020 | 56,5% |
| 1989 | 46,8% | 2005 | 49,2% | 2021 | 55,2% |
| 1990 | 47,1% | 2006 | 48,3% | 2022 | 52,6% |
| 1991 | 55,8% | 2007 | 46,7% | 2023 | 56% |
| 1992 | 60,8% | 2008 | 47,9% | 2024 | 57,8% |
| 1993 | 63,7% | 2009 | 54,1% | 2025 | 57,6% |
| 1994 | 62,2% | 2010 | 54% | 2026 | 58,7% |
| 1995 | 60% | 2011 | 53,8% | | |
Tabella dei dati
| 1980 | 14,8 mld | 1996 | 59,6 mld | 2012 | 112 mld |
| 1981 | 17 mld | 1997 | 60,8 mld | 2013 | 116 mld |
| 1982 | 19,9 mld | 1998 | 61,8 mld | 2014 | 119 mld |
| 1983 | 23 mld | 1999 | 63,3 mld | 2015 | 117 mld |
| 1984 | 25,4 mld | 2000 | 64 mld | 2016 | 119 mld |
| 1985 | 28,8 mld | 2001 | 66,9 mld | 2017 | 119 mld |
| 1986 | 31,4 mld | 2002 | 70,4 mld | 2018 | 122 mld |
| 1987 | 34,5 mld | 2003 | 73,3 mld | 2019 | 125 mld |
| 1988 | 38 mld | 2004 | 76,5 mld | 2020 | 133 mld |
| 1989 | 40,2 mld | 2005 | 81 mld | 2021 | 137 mld |
| 1990 | 42,8 mld | 2006 | 83,4 mld | 2022 | 140 mld |
| 1991 | 48,5 mld | 2007 | 87,3 mld | 2023 | 153 mld |
| 1992 | 51,6 mld | 2008 | 93 mld | 2024 | 159 mld |
| 1993 | 54,5 mld | 2009 | 98,3 mld | 2025 | 162 mld |
| 1994 | 56,4 mld | 2010 | 102 mld | 2026 | 168 mld |
| 1995 | 59,1 mld | 2011 | 106 mld | | |