Show data table
| 1983 | 20% | 1998 | 19.9% | 2013 | 20.7% |
| 1984 | 23.1% | 1999 | 19.5% | 2014 | 20.8% |
| 1985 | 22.9% | 2000 | 20.8% | 2015 | 18.3% |
| 1986 | 23.1% | 2001 | 20.2% | 2016 | 16.1% |
| 1987 | 23.9% | 2002 | 19.1% | 2017 | 15.9% |
| 1988 | 19.5% | 2003 | 18.9% | 2018 | 17.7% |
| 1989 | 22.7% | 2004 | 21.5% | 2019 | 16.3% |
| 1990 | 22.5% | 2005 | 23.5% | 2020 | 14.7% |
| 1991 | 21.8% | 2006 | 24.8% | 2021 | 15.1% |
| 1992 | 18.5% | 2007 | 24.9% | 2022 | 16.6% |
| 1993 | 18.6% | 2008 | 22.5% | 2023 | 17.9% |
| 1994 | 18.3% | 2009 | 19.2% | 2024 | 17.5% |
| 1995 | 18.2% | 2010 | 21.5% | 2025 | 17.3% |
| 1996 | 19.6% | 2011 | 21.9% | 2026 | 18.2% |
| 1997 | 21.2% | 2012 | 21.2% | | |
Show data table
| 1983 | 632M | 1998 | 2.29B | 2013 | 9.9B |
| 1984 | 723M | 1999 | 2.54B | 2014 | 11.9B |
| 1985 | 743M | 2000 | 2.99B | 2015 | 11B |
| 1986 | 792M | 2001 | 3.11B | 2016 | 10.5B |
| 1987 | 843M | 2002 | 3.26B | 2017 | 11.5B |
| 1988 | 911M | 2003 | 3.69B | 2018 | 14.1B |
| 1989 | 1.02B | 2004 | 4.34B | 2019 | 13.7B |
| 1990 | 1.02B | 2005 | 5.34B | 2020 | 12.1B |
| 1991 | 1.16B | 2006 | 6.33B | 2021 | 13.9B |
| 1992 | 1.15B | 2007 | 7.05B | 2022 | 18.5B |
| 1993 | 1.34B | 2008 | 7.09B | 2023 | 19.8B |
| 1994 | 1.49B | 2009 | 6.14B | 2024 | 20.8B |
| 1995 | 1.66B | 2010 | 8.31B | 2025 | 23.2B |
| 1996 | 1.97B | 2011 | 9.34B | 2026 | 27B |
| 1997 | 2.22B | 2012 | 9.42B | | |
Show data table
| 1983 | 23% | 1998 | 20% | 2013 | 27.6% |
| 1984 | 24.2% | 1999 | 21.4% | 2014 | 27.1% |
| 1985 | 24.7% | 2000 | 20.5% | 2015 | 22.8% |
| 1986 | 25.5% | 2001 | 21.6% | 2016 | 20.9% |
| 1987 | 23.6% | 2002 | 20.8% | 2017 | 18.4% |
| 1988 | 19.1% | 2003 | 18.7% | 2018 | 20.3% |
| 1989 | 22.3% | 2004 | 19.4% | 2019 | 21.3% |
| 1990 | 24.5% | 2005 | 20.6% | 2020 | 23.5% |
| 1991 | 22.4% | 2006 | 19.4% | 2021 | 22% |
| 1992 | 22.8% | 2007 | 18% | 2022 | 21.9% |
| 1993 | 23.5% | 2008 | 19.8% | 2023 | 22.3% |
| 1994 | 19.3% | 2009 | 24.7% | 2024 | 20.9% |
| 1995 | 17.1% | 2010 | 18.4% | 2025 | 19.7% |
| 1996 | 17.6% | 2011 | 19.7% | 2026 | 19.3% |
| 1997 | 20.6% | 2012 | 22.4% | | |
Show data table
| 1983 | 728M | 1998 | 2.31B | 2013 | 13.2B |
| 1984 | 758M | 1999 | 2.8B | 2014 | 15.5B |
| 1985 | 803M | 2000 | 2.94B | 2015 | 13.7B |
| 1986 | 876M | 2001 | 3.31B | 2016 | 13.6B |
| 1987 | 832M | 2002 | 3.56B | 2017 | 13.3B |
| 1988 | 896M | 2003 | 3.65B | 2018 | 16.1B |
| 1989 | 1B | 2004 | 3.93B | 2019 | 17.9B |
| 1990 | 1.11B | 2005 | 4.69B | 2020 | 19.4B |
| 1991 | 1.19B | 2006 | 4.97B | 2021 | 20.1B |
| 1992 | 1.42B | 2007 | 5.1B | 2022 | 24.4B |
| 1993 | 1.69B | 2008 | 6.23B | 2023 | 24.6B |
| 1994 | 1.58B | 2009 | 7.89B | 2024 | 24.8B |
| 1995 | 1.56B | 2010 | 7.13B | 2025 | 26.4B |
| 1996 | 1.76B | 2011 | 8.4B | 2026 | 28.6B |
| 1997 | 2.15B | 2012 | 9.95B | | |