Show data table
| 1998 | 31.7% | 2008 | 36.2% | 2018 | 34.6% |
| 1999 | 36.3% | 2009 | 32.9% | 2019 | 35.1% |
| 2000 | 36.5% | 2010 | 30.8% | 2020 | 34.7% |
| 2001 | 35.9% | 2011 | 30.1% | 2021 | 35.6% |
| 2002 | 34.5% | 2012 | 32.1% | 2022 | 36.8% |
| 2003 | 35.8% | 2013 | 33.7% | 2023 | 34.5% |
| 2004 | 36.2% | 2014 | 33.4% | 2024 | 33.3% |
| 2005 | 36.2% | 2015 | 34.6% | 2025 | 35.9% |
| 2006 | 35.7% | 2016 | 34.3% | 2026 | 34.5% |
| 2007 | 36.2% | 2017 | 32.9% | | |
Show data table
| 1998 | 4.29B | 2008 | 13.5B | 2018 | 19.4B |
| 1999 | 4.65B | 2009 | 12.3B | 2019 | 21.5B |
| 2000 | 5.25B | 2010 | 11.8B | 2020 | 21.5B |
| 2001 | 5.69B | 2011 | 12.5B | 2021 | 25.4B |
| 2002 | 6B | 2012 | 13.6B | 2022 | 31.6B |
| 2003 | 6.7B | 2013 | 14.2B | 2023 | 32.6B |
| 2004 | 7.63B | 2014 | 14.4B | 2024 | 34.9B |
| 2005 | 8.71B | 2015 | 15.8B | 2025 | 41.6B |
| 2006 | 9.79B | 2016 | 16.7B | 2026 | 43.4B |
| 2007 | 11.8B | 2017 | 17.2B | | |
Show data table
| 1998 | 30.6% | 2008 | 33.5% | 2018 | 34.4% |
| 1999 | 36.2% | 2009 | 33.8% | 2019 | 36.1% |
| 2000 | 37.1% | 2010 | 34.6% | 2020 | 37.7% |
| 2001 | 36.5% | 2011 | 32% | 2021 | 38.5% |
| 2002 | 35.1% | 2012 | 32.5% | 2022 | 37.6% |
| 2003 | 35.8% | 2013 | 35.5% | 2023 | 37.5% |
| 2004 | 34.6% | 2014 | 37.1% | 2024 | 36.3% |
| 2005 | 34% | 2015 | 37.3% | 2025 | 38.9% |
| 2006 | 32.5% | 2016 | 32.7% | 2026 | 37.8% |
| 2007 | 33.1% | 2017 | 32% | | |
Show data table
| 1998 | 4.14B | 2008 | 12.5B | 2018 | 19.3B |
| 1999 | 4.63B | 2009 | 12.6B | 2019 | 22.1B |
| 2000 | 5.34B | 2010 | 13.2B | 2020 | 23.3B |
| 2001 | 5.78B | 2011 | 13.3B | 2021 | 27.4B |
| 2002 | 6.11B | 2012 | 13.7B | 2022 | 32.3B |
| 2003 | 6.7B | 2013 | 14.9B | 2023 | 35.5B |
| 2004 | 7.29B | 2014 | 16B | 2024 | 38B |
| 2005 | 8.18B | 2015 | 17.1B | 2025 | 45.1B |
| 2006 | 8.91B | 2016 | 16B | 2026 | 47.5B |
| 2007 | 10.8B | 2017 | 16.8B | | |