Show data table
| 1997 | 12.5% | 2007 | 16.6% | 2017 | 14.1% |
| 1998 | 12.3% | 2008 | 15.1% | 2018 | 14.3% |
| 1999 | 12.6% | 2009 | 13.3% | 2019 | 14.4% |
| 2000 | 13.2% | 2010 | 13.1% | 2020 | 14.2% |
| 2001 | 14.2% | 2011 | 12.9% | 2021 | 15.5% |
| 2002 | 14.2% | 2012 | 13.6% | 2022 | 15.3% |
| 2003 | 13% | 2013 | 14.1% | 2023 | 15.8% |
| 2004 | 13.7% | 2014 | 14.3% | 2024 | 16.4% |
| 2005 | 14.8% | 2015 | 16.7% | 2025 | 15.8% |
| 2006 | 15.3% | 2016 | 13.9% | 2026 | 15.9% |
Show data table
| 1997 | 35.1B | 2007 | 242B | 2017 | 531B |
| 1998 | 39.2B | 2008 | 250B | 2018 | 601B |
| 1999 | 44.2B | 2009 | 230B | 2019 | 657B |
| 2000 | 52.1B | 2010 | 259B | 2020 | 632B |
| 2001 | 60.5B | 2011 | 285B | 2021 | 841B |
| 2002 | 67.8B | 2012 | 323B | 2022 | 956B |
| 2003 | 81.6B | 2013 | 369B | 2023 | 1.07T |
| 2004 | 129B | 2014 | 417B | 2024 | 1.21T |
| 2005 | 160B | 2015 | 534B | 2025 | 1.24T |
| 2006 | 193B | 2016 | 484B | 2026 | 1.37T |
Show data table
| 1997 | 13.2% | 2007 | 16.3% | 2017 | 17.3% |
| 1998 | 12.6% | 2008 | 18.5% | 2018 | 16.5% |
| 1999 | 13.4% | 2009 | 16.2% | 2019 | 17.8% |
| 2000 | 14.1% | 2010 | 16.1% | 2020 | 22.2% |
| 2001 | 14.9% | 2011 | 16% | 2021 | 18.4% |
| 2002 | 16.5% | 2012 | 19.8% | 2022 | 18.5% |
| 2003 | 17.2% | 2013 | 18.5% | 2023 | 19.1% |
| 2004 | 17.3% | 2014 | 17% | 2024 | 19.5% |
| 2005 | 15.5% | 2015 | 16.7% | 2025 | 19.3% |
| 2006 | 16.9% | 2016 | 17% | 2026 | 19.4% |
Show data table
| 1997 | 36.9B | 2007 | 238B | 2017 | 649B |
| 1998 | 40.1B | 2008 | 307B | 2018 | 693B |
| 1999 | 47B | 2009 | 280B | 2019 | 815B |
| 2000 | 55.4B | 2010 | 318B | 2020 | 985B |
| 2001 | 63.6B | 2011 | 353B | 2021 | 1,000B |
| 2002 | 78.7B | 2012 | 472B | 2022 | 1.16T |
| 2003 | 108B | 2013 | 484B | 2023 | 1.29T |
| 2004 | 162B | 2014 | 497B | 2024 | 1.44T |
| 2005 | 168B | 2015 | 535B | 2025 | 1.53T |
| 2006 | 214B | 2016 | 592B | 2026 | 1.67T |