Show data table
| 1996 | 3.58B | 2007 | 15.8B | 2018 | 20.5B |
| 1997 | 4.58B | 2008 | 19.2B | 2019 | 20.5B |
| 1998 | 5.28B | 2009 | 17.7B | 2020 | 20.3B |
| 1999 | 5.77B | 2010 | 17.2B | 2021 | 23.7B |
| 2000 | 5.57B | 2011 | 18.7B | 2022 | 24.6B |
| 2001 | 5.8B | 2012 | 17.2B | 2023 | 27.6B |
| 2002 | 6.73B | 2013 | 18.2B | 2024 | 29.7B |
| 2003 | 8.5B | 2014 | 18.6B | 2025 | 33B |
| 2004 | 10.2B | 2015 | 16.4B | 2026 | 36.8B |
| 2005 | 11.2B | 2016 | 17.1B | | |
| 2006 | 12.9B | 2017 | 18.4B | | |
Show data table
| 1994 | 2.69B | 2005 | 17.7B | 2016 | 30.3B |
| 1995 | 3.47B | 2006 | 20.1B | 2017 | 31.8B |
| 1996 | 5.52B | 2007 | 22.5B | 2018 | 33.9B |
| 1997 | 7.89B | 2008 | 25.5B | 2019 | 35.8B |
| 1998 | 9.22B | 2009 | 24.8B | 2020 | 34.7B |
| 1999 | 10.6B | 2010 | 25.4B | 2021 | 39.1B |
| 2000 | 11.8B | 2011 | 26.2B | 2022 | 45.6B |
| 2001 | 12.7B | 2012 | 26.2B | 2023 | 49.9B |
| 2002 | 14B | 2013 | 26.8B | 2024 | 53.8B |
| 2003 | 14.7B | 2014 | 27.4B | 2025 | 57.1B |
| 2004 | 16B | 2015 | 28.9B | 2026 | 61B |
Show data table
| 1994 | 6.47B | 2005 | 26.5B | 2016 | 34.1B |
| 1995 | 7.8B | 2006 | 28B | 2017 | 35.2B |
| 1996 | 12.7B | 2007 | 29.6B | 2018 | 36.5B |
| 1997 | 15.5B | 2008 | 31.2B | 2019 | 37.6B |
| 1998 | 17.7B | 2009 | 30.3B | 2020 | 36.5B |
| 1999 | 19.6B | 2010 | 30.5B | 2021 | 39.1B |
| 2000 | 20.5B | 2011 | 30.8B | 2022 | 40.8B |
| 2001 | 22B | 2012 | 30.6B | 2023 | 41.6B |
| 2002 | 23.1B | 2013 | 31.3B | 2024 | 43B |
| 2003 | 24B | 2014 | 31.7B | 2025 | 43.8B |
| 2004 | 25.5B | 2015 | 33B | 2026 | 44.8B |