Show data table
| 1988 | 36% | 2001 | 25.8% | 2014 | 28.7% |
| 1989 | 26.4% | 2002 | 24.4% | 2015 | 26.8% |
| 1990 | 26.6% | 2003 | 25.4% | 2016 | 21.4% |
| 1991 | 29.8% | 2004 | 25.3% | 2017 | 20.5% |
| 1992 | 26% | 2005 | 30.4% | 2018 | 24.3% |
| 1993 | 27.5% | 2006 | 34.3% | 2019 | 27.3% |
| 1994 | 26.5% | 2007 | 30% | 2020 | 23.3% |
| 1995 | 26.9% | 2008 | 33.9% | 2021 | 23% |
| 1996 | 27.7% | 2009 | 28.5% | 2022 | 29.2% |
| 1997 | 27.5% | 2010 | 31.7% | 2023 | 31.2% |
| 1998 | 25.4% | 2011 | 29.7% | 2024 | 26.3% |
| 1999 | 23.9% | 2012 | 28.6% | 2025 | 26.9% |
| 2000 | 24.3% | 2013 | 29% | 2026 | 30.2% |
Show data table
| 1988 | 4.75B | 2001 | 14.2B | 2014 | 53.8B |
| 1989 | 4.86B | 2002 | 13.8B | 2015 | 47B |
| 1990 | 5.61B | 2003 | 17.3B | 2016 | 34.4B |
| 1991 | 6.76B | 2004 | 20.6B | 2017 | 32.9B |
| 1992 | 6.08B | 2005 | 29.6B | 2018 | 39.3B |
| 1993 | 6.76B | 2006 | 38.9B | 2019 | 43.5B |
| 1994 | 7.57B | 2007 | 40.1B | 2020 | 33.8B |
| 1995 | 8.51B | 2008 | 56.8B | 2021 | 36.3B |
| 1996 | 9.54B | 2009 | 39B | 2022 | 53.9B |
| 1997 | 9.95B | 2010 | 43.9B | 2023 | 54.5B |
| 1998 | 9.7B | 2011 | 47.5B | 2024 | 45.3B |
| 1999 | 10.1B | 2012 | 49.3B | 2025 | 46.9B |
| 2000 | 12.2B | 2013 | 52.8B | 2026 | 54.2B |
Show data table
| 1988 | 45.3% | 2001 | 25.2% | 2014 | 33% |
| 1989 | 30.9% | 2002 | 24.6% | 2015 | 34.1% |
| 1990 | 27.9% | 2003 | 23.5% | 2016 | 31.2% |
| 1991 | 30% | 2004 | 23.3% | 2017 | 30.9% |
| 1992 | 28.8% | 2005 | 29.5% | 2018 | 30.2% |
| 1993 | 27.3% | 2006 | 34.6% | 2019 | 31% |
| 1994 | 26.5% | 2007 | 26.8% | 2020 | 35.1% |
| 1995 | 26.7% | 2008 | 28.2% | 2021 | 31.4% |
| 1996 | 28.2% | 2009 | 33.4% | 2022 | 28.3% |
| 1997 | 27.4% | 2010 | 31.5% | 2023 | 32.4% |
| 1998 | 27.3% | 2011 | 30.4% | 2024 | 32.2% |
| 1999 | 24.8% | 2012 | 29.9% | 2025 | 32.4% |
| 2000 | 24.1% | 2013 | 31.7% | 2026 | 34.7% |
Show data table
| 1988 | 5.98B | 2001 | 13.9B | 2014 | 61.9B |
| 1989 | 5.68B | 2002 | 14B | 2015 | 59.9B |
| 1990 | 5.88B | 2003 | 16B | 2016 | 50.3B |
| 1991 | 6.8B | 2004 | 19.1B | 2017 | 49.7B |
| 1992 | 6.73B | 2005 | 28.8B | 2018 | 48.8B |
| 1993 | 6.7B | 2006 | 39.3B | 2019 | 49.4B |
| 1994 | 7.57B | 2007 | 35.7B | 2020 | 51B |
| 1995 | 8.46B | 2008 | 47.3B | 2021 | 49.6B |
| 1996 | 9.7B | 2009 | 45.7B | 2022 | 52.1B |
| 1997 | 9.91B | 2010 | 43.7B | 2023 | 56.6B |
| 1998 | 10.4B | 2011 | 48.6B | 2024 | 55.5B |
| 1999 | 10.5B | 2012 | 51.5B | 2025 | 56.5B |
| 2000 | 12.1B | 2013 | 57.7B | 2026 | 62.4B |