Show data table
| 1990 | 30.7% | 2003 | 23.5% | 2016 | 20.3% |
| 1991 | 29% | 2004 | 22.5% | 2017 | 19.6% |
| 1992 | 30% | 2005 | 21.7% | 2018 | 20.2% |
| 1993 | 28.1% | 2006 | 23% | 2019 | 21.6% |
| 1994 | 28.7% | 2007 | 23.3% | 2020 | 20.1% |
| 1995 | 25.7% | 2008 | 23.5% | 2021 | 18.4% |
| 1996 | 25.7% | 2009 | 25% | 2022 | 20.1% |
| 1997 | 26% | 2010 | 22.3% | 2023 | 20.9% |
| 1998 | 22.5% | 2011 | 23.5% | 2024 | 20.6% |
| 1999 | 21.6% | 2012 | 25.4% | 2025 | 19.9% |
| 2000 | 19.6% | 2013 | 24.3% | 2026 | 19.2% |
| 2001 | 23.9% | 2014 | 23.3% | | |
| 2002 | 23.2% | 2015 | 22.2% | | |
Show data table
| 1990 | 39.2B | 2003 | 107B | 2016 | 253B |
| 1991 | 42.7B | 2004 | 116B | 2017 | 269B |
| 1992 | 49.3B | 2005 | 124B | 2018 | 292B |
| 1993 | 52.6B | 2006 | 144B | 2019 | 326B |
| 1994 | 61.1B | 2007 | 163B | 2020 | 286B |
| 1995 | 62.3B | 2008 | 190B | 2021 | 285B |
| 1996 | 70.9B | 2009 | 187B | 2022 | 360B |
| 1997 | 79.8B | 2010 | 186B | 2023 | 381B |
| 1998 | 69.4B | 2011 | 217B | 2024 | 398B |
| 1999 | 70.9B | 2012 | 250B | 2025 | 402B |
| 2000 | 76B | 2013 | 251B | 2026 | 419B |
| 2001 | 91.6B | 2014 | 262B | | |
| 2002 | 96.8B | 2015 | 261B | | |
Show data table
| 1990 | 30.5% | 2003 | 28.1% | 2016 | 22.9% |
| 1991 | 27.4% | 2004 | 25.9% | 2017 | 22% |
| 1992 | 28.2% | 2005 | 24.5% | 2018 | 22.8% |
| 1993 | 24.6% | 2006 | 25.6% | 2019 | 23.6% |
| 1994 | 23.3% | 2007 | 25.9% | 2020 | 25% |
| 1995 | 22.6% | 2008 | 26.9% | 2021 | 24.5% |
| 1996 | 22.4% | 2009 | 30.9% | 2022 | 24.6% |
| 1997 | 21.2% | 2010 | 26.6% | 2023 | 25% |
| 1998 | 23.1% | 2011 | 27.1% | 2024 | 24% |
| 1999 | 24.6% | 2012 | 28.5% | 2025 | 23.4% |
| 2000 | 25.6% | 2013 | 27.8% | 2026 | 22.5% |
| 2001 | 28.2% | 2014 | 26% | | |
| 2002 | 27.1% | 2015 | 24.7% | | |
Show data table
| 1990 | 39B | 2003 | 128B | 2016 | 286B |
| 1991 | 40.3B | 2004 | 134B | 2017 | 302B |
| 1992 | 46.3B | 2005 | 140B | 2018 | 330B |
| 1993 | 46.2B | 2006 | 160B | 2019 | 357B |
| 1994 | 49.5B | 2007 | 180B | 2020 | 355B |
| 1995 | 54.8B | 2008 | 217B | 2021 | 379B |
| 1996 | 61.9B | 2009 | 231B | 2022 | 442B |
| 1997 | 64.9B | 2010 | 222B | 2023 | 456B |
| 1998 | 71.3B | 2011 | 250B | 2024 | 464B |
| 1999 | 80.7B | 2012 | 281B | 2025 | 474B |
| 2000 | 99.5B | 2013 | 287B | 2026 | 491B |
| 2001 | 108B | 2014 | 291B | | |
| 2002 | 113B | 2015 | 291B | | |