Show data table
| 1983 | 28% | 1998 | 31% | 2013 | 31.5% |
| 1984 | 27.9% | 1999 | 31.2% | 2014 | 31.3% |
| 1985 | 27.7% | 2000 | 32.2% | 2015 | 32.5% |
| 1986 | 28.6% | 2001 | 31.4% | 2016 | 32.2% |
| 1987 | 28.5% | 2002 | 31.9% | 2017 | 33% |
| 1988 | 28.8% | 2003 | 31.5% | 2018 | 32.3% |
| 1989 | 28.1% | 2004 | 31.3% | 2019 | 32.6% |
| 1990 | 27.2% | 2005 | 31.3% | 2020 | 33.3% |
| 1991 | 27.2% | 2006 | 30.9% | 2021 | 33.1% |
| 1992 | 27.9% | 2007 | 30.5% | 2022 | 31.6% |
| 1993 | 28.9% | 2008 | 31.5% | 2023 | 31.1% |
| 1994 | 29.4% | 2009 | 31.7% | 2024 | 31.8% |
| 1995 | 30.1% | 2010 | 31.2% | 2025 | 31.7% |
| 1996 | 30.5% | 2011 | 31.6% | 2026 | 31.7% |
| 1997 | 30.2% | 2012 | 31.4% | | |
Show data table
| 1983 | 68.3B | 1998 | 138B | 2013 | 210B |
| 1984 | 72.7B | 1999 | 142B | 2014 | 213B |
| 1985 | 76.6B | 2000 | 153B | 2015 | 221B |
| 1986 | 83.2B | 2001 | 154B | 2016 | 221B |
| 1987 | 85.8B | 2002 | 156B | 2017 | 230B |
| 1988 | 92.1B | 2003 | 155B | 2018 | 234B |
| 1989 | 97B | 2004 | 159B | 2019 | 239B |
| 1990 | 102B | 2005 | 165B | 2020 | 237B |
| 1991 | 107B | 2006 | 174B | 2021 | 254B |
| 1992 | 111B | 2007 | 183B | 2022 | 259B |
| 1993 | 118B | 2008 | 196B | 2023 | 259B |
| 1994 | 123B | 2009 | 194B | 2024 | 272B |
| 1995 | 128B | 2010 | 198B | 2025 | 275B |
| 1996 | 130B | 2011 | 204B | 2026 | 280B |
| 1997 | 131B | 2012 | 205B | | |
Show data table
| 1983 | 28.5% | 1998 | 32.3% | 2013 | 32% |
| 1984 | 28.1% | 1999 | 32.8% | 2014 | 31.5% |
| 1985 | 27.7% | 2000 | 31.9% | 2015 | 31.9% |
| 1986 | 27.6% | 2001 | 31.2% | 2016 | 31.9% |
| 1987 | 27.4% | 2002 | 33.6% | 2017 | 31.9% |
| 1988 | 27.9% | 2003 | 32.8% | 2018 | 31.1% |
| 1989 | 27.3% | 2004 | 32.6% | 2019 | 31.3% |
| 1990 | 27.2% | 2005 | 31.9% | 2020 | 36.3% |
| 1991 | 29% | 2006 | 30.1% | 2021 | 33.4% |
| 1992 | 30.8% | 2007 | 29% | 2022 | 30.5% |
| 1993 | 31.9% | 2008 | 29.6% | 2023 | 30.9% |
| 1994 | 32% | 2009 | 31.2% | 2024 | 31.3% |
| 1995 | 32% | 2010 | 30.9% | 2025 | 31.2% |
| 1996 | 32.5% | 2011 | 31% | 2026 | 31.5% |
| 1997 | 32.5% | 2012 | 31.1% | | |
Show data table
| 1983 | 69.7B | 1998 | 144B | 2013 | 213B |
| 1984 | 73.3B | 1999 | 149B | 2014 | 214B |
| 1985 | 76.6B | 2000 | 152B | 2015 | 217B |
| 1986 | 80.1B | 2001 | 153B | 2016 | 220B |
| 1987 | 82.6B | 2002 | 164B | 2017 | 222B |
| 1988 | 89.2B | 2003 | 162B | 2018 | 225B |
| 1989 | 94.4B | 2004 | 166B | 2019 | 229B |
| 1990 | 102B | 2005 | 169B | 2020 | 258B |
| 1991 | 114B | 2006 | 169B | 2021 | 256B |
| 1992 | 123B | 2007 | 174B | 2022 | 250B |
| 1993 | 130B | 2008 | 184B | 2023 | 258B |
| 1994 | 134B | 2009 | 191B | 2024 | 267B |
| 1995 | 135B | 2010 | 196B | 2025 | 271B |
| 1996 | 139B | 2011 | 200B | 2026 | 278B |
| 1997 | 141B | 2012 | 204B | | |