Show data table
| 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% | | |
Show data table
| 1980 | 42.3B | 1996 | 105B | 2012 | 201B |
| 1981 | 44.9B | 1997 | 111B | 2013 | 208B |
| 1982 | 49.9B | 1998 | 116B | 2014 | 212B |
| 1983 | 53.3B | 1999 | 121B | 2015 | 214B |
| 1984 | 58.3B | 2000 | 126B | 2016 | 218B |
| 1985 | 62.1B | 2001 | 131B | 2017 | 228B |
| 1986 | 64B | 2002 | 136B | 2018 | 236B |
| 1987 | 67B | 2003 | 138B | 2019 | 238B |
| 1988 | 69.7B | 2004 | 146B | 2020 | 229B |
| 1989 | 72.6B | 2005 | 152B | 2021 | 251B |
| 1990 | 78.3B | 2006 | 159B | 2022 | 274B |
| 1991 | 83.1B | 2007 | 167B | 2023 | 294B |
| 1992 | 86.4B | 2008 | 175B | 2024 | 308B |
| 1993 | 92.5B | 2009 | 171B | 2025 | 319B |
| 1994 | 97.5B | 2010 | 181B | 2026 | 328B |
| 1995 | 101B | 2011 | 192B | | |
Show data table
| 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% | | |
Show data table
| 1980 | 51B | 1996 | 114B | 2012 | 218B |
| 1981 | 59.9B | 1997 | 116B | 2013 | 221B |
| 1982 | 62.8B | 1998 | 119B | 2014 | 224B |
| 1983 | 69.4B | 1999 | 122B | 2015 | 224B |
| 1984 | 71.3B | 2000 | 127B | 2016 | 229B |
| 1985 | 74.9B | 2001 | 131B | 2017 | 232B |
| 1986 | 77.3B | 2002 | 136B | 2018 | 241B |
| 1987 | 77.9B | 2003 | 144B | 2019 | 248B |
| 1988 | 80.5B | 2004 | 146B | 2020 | 271B |
| 1989 | 84.8B | 2005 | 161B | 2021 | 278B |
| 1990 | 89.9B | 2006 | 159B | 2022 | 295B |
| 1991 | 96.4B | 2007 | 167B | 2023 | 318B |
| 1992 | 102B | 2008 | 179B | 2024 | 335B |
| 1993 | 107B | 2009 | 190B | 2025 | 353B |
| 1994 | 108B | 2010 | 196B | 2026 | 362B |
| 1995 | 111B | 2011 | 208B | | |