Show data table
| 1985 | 39.1% | 1999 | 38.1% | 2013 | 37.3% |
| 1986 | 41.5% | 2000 | 38.4% | 2014 | 37.3% |
| 1987 | 42.6% | 2001 | 38.5% | 2015 | 37.5% |
| 1988 | 44.2% | 2002 | 39.3% | 2016 | 37.4% |
| 1989 | 45.6% | 2003 | 40.3% | 2017 | 36.9% |
| 1990 | 46.8% | 2004 | 40.6% | 2018 | 37.4% |
| 1991 | 46.8% | 2005 | 42.2% | 2019 | 36.3% |
| 1992 | 46.2% | 2006 | 42.4% | 2020 | 37.7% |
| 1993 | 45.2% | 2007 | 40.6% | 2021 | 38.5% |
| 1994 | 44.7% | 2008 | 39.9% | 2022 | 37.7% |
| 1995 | 45.3% | 2009 | 38.5% | 2023 | 37.8% |
| 1996 | 42.4% | 2010 | 37.4% | 2024 | 38.5% |
| 1997 | 40.5% | 2011 | 37.4% | 2025 | 37.7% |
| 1998 | 39.6% | 2012 | 37.5% | 2026 | 37.2% |
Show data table
| 1985 | 17.7B | 1999 | 42.4B | 2013 | 85B |
| 1986 | 21.7B | 2000 | 45.5B | 2014 | 89.8B |
| 1987 | 26.6B | 2001 | 48.6B | 2015 | 94.5B |
| 1988 | 30.6B | 2002 | 52.5B | 2016 | 99.7B |
| 1989 | 33.6B | 2003 | 57.1B | 2017 | 106B |
| 1990 | 35.8B | 2004 | 62.1B | 2018 | 113B |
| 1991 | 35.2B | 2005 | 67.8B | 2019 | 116B |
| 1992 | 35.7B | 2006 | 71.7B | 2020 | 122B |
| 1993 | 37.5B | 2007 | 74.4B | 2021 | 136B |
| 1994 | 39.9B | 2008 | 75.8B | 2022 | 145B |
| 1995 | 42.9B | 2009 | 74B | 2023 | 156B |
| 1996 | 42.6B | 2010 | 75.5B | 2024 | 165B |
| 1997 | 42.1B | 2011 | 78.9B | 2025 | 168B |
| 1998 | 41.9B | 2012 | 81.1B | 2026 | 174B |
Show data table
| 1985 | 46.1% | 1999 | 39.2% | 2013 | 38.5% |
| 1986 | 46.8% | 2000 | 38.2% | 2014 | 37.6% |
| 1987 | 46% | 2001 | 37.2% | 2015 | 37.2% |
| 1988 | 46.1% | 2002 | 36.7% | 2016 | 36.4% |
| 1989 | 47.7% | 2003 | 36.6% | 2017 | 35.6% |
| 1990 | 49.5% | 2004 | 36.1% | 2018 | 36.1% |
| 1991 | 52.9% | 2005 | 37.1% | 2019 | 38.7% |
| 1992 | 52.4% | 2006 | 37.8% | 2020 | 41.9% |
| 1993 | 46.7% | 2007 | 37% | 2021 | 41.8% |
| 1994 | 42.7% | 2008 | 38.4% | 2022 | 41.7% |
| 1995 | 41.6% | 2009 | 40.3% | 2023 | 41% |
| 1996 | 39.8% | 2010 | 42.9% | 2024 | 41.7% |
| 1997 | 39.3% | 2011 | 42.3% | 2025 | 41.6% |
| 1998 | 40.1% | 2012 | 39.6% | 2026 | 41.2% |
Show data table
| 1985 | 20.8B | 1999 | 43.6B | 2013 | 88B |
| 1986 | 24.5B | 2000 | 45.3B | 2014 | 90.6B |
| 1987 | 28.7B | 2001 | 47B | 2015 | 93.6B |
| 1988 | 31.9B | 2002 | 49.1B | 2016 | 97.1B |
| 1989 | 35.2B | 2003 | 51.8B | 2017 | 102B |
| 1990 | 37.9B | 2004 | 55.2B | 2018 | 109B |
| 1991 | 39.8B | 2005 | 59.6B | 2019 | 124B |
| 1992 | 40.5B | 2006 | 63.9B | 2020 | 136B |
| 1993 | 38.7B | 2007 | 67.8B | 2021 | 148B |
| 1994 | 38.1B | 2008 | 73B | 2022 | 161B |
| 1995 | 39.4B | 2009 | 77.5B | 2023 | 169B |
| 1996 | 40B | 2010 | 86.6B | 2024 | 178B |
| 1997 | 40.8B | 2011 | 89.4B | 2025 | 185B |
| 1998 | 42.4B | 2012 | 85.8B | 2026 | 192B |