Show data table
| 1985 | 4.83B | 1999 | 5.78B | 2013 | 18.1B |
| 1986 | 3.29B | 2000 | 6.65B | 2014 | 17.1B |
| 1987 | 3.87B | 2001 | 6.21B | 2015 | 12.9B |
| 1988 | 3.69B | 2002 | 6.48B | 2016 | 11.4B |
| 1989 | 4.11B | 2003 | 7.27B | 2017 | 12.1B |
| 1990 | 4.92B | 2004 | 8.72B | 2018 | 13.6B |
| 1991 | 5.25B | 2005 | 10.6B | 2019 | 13.5B |
| 1992 | 5.53B | 2006 | 12.7B | 2020 | 12B |
| 1993 | 5.59B | 2007 | 13.6B | 2021 | 14B |
| 1994 | 6B | 2008 | 15.9B | 2022 | 16.7B |
| 1995 | 7.15B | 2009 | 11.9B | 2023 | 15.1B |
| 1996 | 7.2B | 2010 | 13.7B | 2024 | 15.3B |
| 1997 | 7.04B | 2011 | 18.5B | 2025 | 15.9B |
| 1998 | 5.35B | 2012 | 19.1B | 2026 | 16.9B |
Show data table
| 1985 | 10.6B | 1999 | 9.8B | 2013 | 22.6B |
| 1986 | 7.17B | 2000 | 11.5B | 2014 | 21.7B |
| 1987 | 8.15B | 2001 | 11.1B | 2015 | 17.8B |
| 1988 | 7.42B | 2002 | 11.6B | 2016 | 15.7B |
| 1989 | 8.01B | 2003 | 12.7B | 2017 | 16.7B |
| 1990 | 8.92B | 2004 | 14.7B | 2018 | 18.3B |
| 1991 | 9.08B | 2005 | 17.6B | 2019 | 18.4B |
| 1992 | 9B | 2006 | 20.2B | 2020 | 16.6B |
| 1993 | 9.03B | 2007 | 20.5B | 2021 | 18.8B |
| 1994 | 9.17B | 2008 | 22.6B | 2022 | 23B |
| 1995 | 10.1B | 2009 | 17.3B | 2023 | 20.3B |
| 1996 | 10.2B | 2010 | 18.7B | 2024 | 20.5B |
| 1997 | 10.5B | 2011 | 23.3B | 2025 | 20.9B |
| 1998 | 8.96B | 2012 | 23.8B | 2026 | 21.8B |
Show data table
| 1985 | 13B | 1999 | 15.9B | 2013 | 19.2B |
| 1986 | 12.7B | 2000 | 17.6B | 2014 | 18.7B |
| 1987 | 12.9B | 2001 | 17.9B | 2015 | 18.6B |
| 1988 | 13.1B | 2002 | 18.6B | 2016 | 18.1B |
| 1989 | 12.9B | 2003 | 19.2B | 2017 | 18.4B |
| 1990 | 13.1B | 2004 | 19.3B | 2018 | 18.4B |
| 1991 | 13.5B | 2005 | 19.3B | 2019 | 19.1B |
| 1992 | 14.1B | 2006 | 20.1B | 2020 | 19.3B |
| 1993 | 14.2B | 2007 | 19.3B | 2021 | 19B |
| 1994 | 14.6B | 2008 | 18.5B | 2022 | 18.7B |
| 1995 | 15.3B | 2009 | 18.2B | 2023 | 18.9B |
| 1996 | 15.7B | 2010 | 18.7B | 2024 | 19.7B |
| 1997 | 15.5B | 2011 | 19.4B | 2025 | 19.8B |
| 1998 | 15.4B | 2012 | 19.6B | 2026 | 20.3B |