Show data table
| 1980 | 22.4% | 1996 | 20% | 2012 | 15.8% |
| 1981 | 22.8% | 1997 | 19.6% | 2013 | 16.1% |
| 1982 | 23.4% | 1998 | 21.9% | 2014 | 15.4% |
| 1983 | 21.3% | 1999 | 20.4% | 2015 | 15.6% |
| 1984 | 21.3% | 2000 | 27% | 2016 | 15.3% |
| 1985 | 21.4% | 2001 | 18.7% | 2017 | 15.3% |
| 1986 | 19.7% | 2002 | 16.8% | 2018 | 15.5% |
| 1987 | 19.4% | 2003 | 17.8% | 2019 | 15.5% |
| 1988 | 21.2% | 2004 | 16.6% | 2020 | 15.2% |
| 1989 | 22.9% | 2005 | 18.4% | 2021 | 15.3% |
| 1990 | 24.4% | 2006 | 17.3% | 2022 | 16.2% |
| 1991 | 20.9% | 2007 | 16.8% | 2023 | 16.5% |
| 1992 | 22.4% | 2008 | 17% | 2024 | 16.3% |
| 1993 | 22.8% | 2009 | 16.4% | 2025 | 15.9% |
| 1994 | 22.2% | 2010 | 15% | 2026 | 15.9% |
| 1995 | 21.1% | 2011 | 16.2% | | |
Show data table
| 1980 | 341B | 1996 | 1.6T | 2012 | 2.32T |
| 1981 | 412B | 1997 | 1.7T | 2013 | 2.46T |
| 1982 | 454B | 1998 | 2.05T | 2014 | 2.51T |
| 1983 | 461B | 1999 | 2T | 2015 | 2.66T |
| 1984 | 516B | 2000 | 2.78T | 2016 | 2.69T |
| 1985 | 543B | 2001 | 1.9T | 2017 | 2.75T |
| 1986 | 585B | 2002 | 1.79T | 2018 | 2.85T |
| 1987 | 650B | 2003 | 1.95T | 2019 | 2.93T |
| 1988 | 765B | 2004 | 1.93T | 2020 | 3.04T |
| 1989 | 922B | 2005 | 2.22T | 2021 | 3.32T |
| 1990 | 1.09T | 2006 | 2.18T | 2022 | 3.69T |
| 1991 | 1.05T | 2007 | 2.24T | 2023 | 3.89T |
| 1992 | 1.26T | 2008 | 2.23T | 2024 | 4.18T |
| 1993 | 1.42T | 2009 | 2.11T | 2025 | 4.55T |
| 1994 | 1.5T | 2010 | 2.12T | 2026 | 4.86T |
| 1995 | 1.56T | 2011 | 2.31T | | |
Show data table
| 1980 | 24.8% | 1996 | 27.1% | 2012 | 20.1% |
| 1981 | 25.4% | 1997 | 27.1% | 2013 | 19.3% |
| 1982 | 26.2% | 1998 | 27.2% | 2014 | 18.2% |
| 1983 | 23.1% | 1999 | 22.8% | 2015 | 17.4% |
| 1984 | 22.9% | 2000 | 32.3% | 2016 | 17.5% |
| 1985 | 23.4% | 2001 | 24.3% | 2017 | 17.3% |
| 1986 | 21.5% | 2002 | 22.1% | 2018 | 17.3% |
| 1987 | 21.2% | 2003 | 22.2% | 2019 | 17.2% |
| 1988 | 22.8% | 2004 | 21.2% | 2020 | 18.1% |
| 1989 | 32.6% | 2005 | 20.9% | 2021 | 17.3% |
| 1990 | 28.4% | 2006 | 19.5% | 2022 | 17.9% |
| 1991 | 30.2% | 2007 | 19% | 2023 | 19% |
| 1992 | 29.2% | 2008 | 19.8% | 2024 | 17.7% |
| 1993 | 28.9% | 2009 | 22.6% | 2025 | 18% |
| 1994 | 28.4% | 2010 | 20.1% | 2026 | 18% |
| 1995 | 27.9% | 2011 | 20.2% | | |
Show data table
| 1980 | 377B | 1996 | 2.18T | 2012 | 2.95T |
| 1981 | 458B | 1997 | 2.36T | 2013 | 2.95T |
| 1982 | 509B | 1998 | 2.54T | 2014 | 2.95T |
| 1983 | 502B | 1999 | 2.23T | 2015 | 2.97T |
| 1984 | 554B | 2000 | 3.34T | 2016 | 3.08T |
| 1985 | 594B | 2001 | 2.46T | 2017 | 3.12T |
| 1986 | 637B | 2002 | 2.35T | 2018 | 3.19T |
| 1987 | 709B | 2003 | 2.42T | 2019 | 3.27T |
| 1988 | 826B | 2004 | 2.46T | 2020 | 3.62T |
| 1989 | 1.31T | 2005 | 2.52T | 2021 | 3.77T |
| 1990 | 1.27T | 2006 | 2.45T | 2022 | 4.08T |
| 1991 | 1.51T | 2007 | 2.54T | 2023 | 4.48T |
| 1992 | 1.64T | 2008 | 2.59T | 2024 | 4.56T |
| 1993 | 1.79T | 2009 | 2.91T | 2025 | 5.16T |
| 1994 | 1.92T | 2010 | 2.83T | 2026 | 5.51T |
| 1995 | 2.06T | 2011 | 2.88T | | |