Show data table
| 1996 | 30.2% | 2007 | 25.3% | 2018 | 21.3% |
| 1997 | 31.6% | 2008 | 22.7% | 2019 | 21.2% |
| 1998 | 37.2% | 2009 | 23.1% | 2020 | 25.5% |
| 1999 | 34.7% | 2010 | 23.5% | 2021 | 26.4% |
| 2000 | 34.1% | 2011 | 23.7% | 2022 | 25.3% |
| 2001 | 33.6% | 2012 | 25% | 2023 | 26.3% |
| 2002 | 37.8% | 2013 | 24.6% | 2024 | 26.1% |
| 2003 | 39.6% | 2014 | 24% | 2025 | 26.5% |
| 2004 | 38.1% | 2015 | 23.4% | 2026 | 27.1% |
| 2005 | 31.3% | 2016 | 22% | | |
| 2006 | 26.6% | 2017 | 22.9% | | |
Show data table
| 1996 | 2.77T | 2007 | 10.3T | 2018 | 28.32T |
| 1997 | 3.2T | 2008 | 11.33T | 2019 | 31.04T |
| 1998 | 4.36T | 2009 | 12.26T | 2020 | 35.95T |
| 1999 | 4.65T | 2010 | 13.52T | 2021 | 39.12T |
| 2000 | 4.96T | 2011 | 15.48T | 2022 | 41.09T |
| 2001 | 5.45T | 2012 | 17.87T | 2023 | 45.73T |
| 2002 | 6.67T | 2013 | 19.46T | 2024 | 49.34T |
| 2003 | 7.99T | 2014 | 21.51T | 2025 | 53.5T |
| 2004 | 9.15T | 2015 | 22.88T | 2026 | 58.22T |
| 2005 | 9.16T | 2016 | 23.66T | | |
| 2006 | 9.16T | 2017 | 26.92T | | |