Show data table
| 1997 | 31.9% | 2007 | 32% | 2017 | 29% |
| 1998 | 30.6% | 2008 | 32.8% | 2018 | 28.5% |
| 1999 | 32.5% | 2009 | 30.9% | 2019 | 29.4% |
| 2000 | 34.4% | 2010 | 30.1% | 2020 | 28.4% |
| 2001 | 31.5% | 2011 | 29.4% | 2021 | 30% |
| 2002 | 33% | 2012 | 29.4% | 2022 | 29.8% |
| 2003 | 35.9% | 2013 | 27.8% | 2023 | 30.7% |
| 2004 | 34.5% | 2014 | 27.5% | 2024 | 31.8% |
| 2005 | 32.7% | 2015 | 28.7% | 2025 | 32.2% |
| 2006 | 30.9% | 2016 | 28.4% | 2026 | 32% |
Show data table
| 1997 | 63.7B | 2007 | 119B | 2017 | 179B |
| 1998 | 63.9B | 2008 | 136B | 2018 | 188B |
| 1999 | 73B | 2009 | 128B | 2019 | 204B |
| 2000 | 85.5B | 2010 | 132B | 2020 | 190B |
| 2001 | 79.5B | 2011 | 136B | 2021 | 219B |
| 2002 | 85.2B | 2012 | 137B | 2022 | 243B |
| 2003 | 96.5B | 2013 | 140B | 2023 | 277B |
| 2004 | 96.8B | 2014 | 145B | 2024 | 306B |
| 2005 | 101B | 2015 | 161B | 2025 | 336B |
| 2006 | 104B | 2016 | 169B | 2026 | 361B |
Show data table
| 1997 | 32.3% | 2007 | 31.4% | 2017 | 31.8% |
| 1998 | 32.2% | 2008 | 33.8% | 2018 | 30.3% |
| 1999 | 32.5% | 2009 | 33.6% | 2019 | 31.4% |
| 2000 | 32% | 2010 | 32.5% | 2020 | 36.4% |
| 2001 | 37.4% | 2011 | 31.9% | 2021 | 35.3% |
| 2002 | 38.2% | 2012 | 33.3% | 2022 | 35% |
| 2003 | 36% | 2013 | 31.7% | 2023 | 35.3% |
| 2004 | 34.1% | 2014 | 31.7% | 2024 | 36.1% |
| 2005 | 32.5% | 2015 | 32.2% | 2025 | 36.2% |
| 2006 | 31.5% | 2016 | 31.1% | 2026 | 36.2% |
Show data table
| 1997 | 64.4B | 2007 | 117B | 2017 | 196B |
| 1998 | 67.3B | 2008 | 140B | 2018 | 200B |
| 1999 | 73B | 2009 | 139B | 2019 | 218B |
| 2000 | 79.6B | 2010 | 142B | 2020 | 244B |
| 2001 | 94.3B | 2011 | 148B | 2021 | 257B |
| 2002 | 98.8B | 2012 | 155B | 2022 | 286B |
| 2003 | 96.7B | 2013 | 159B | 2023 | 319B |
| 2004 | 95.8B | 2014 | 167B | 2024 | 348B |
| 2005 | 100B | 2015 | 180B | 2025 | 378B |
| 2006 | 105B | 2016 | 185B | 2026 | 408B |