Show data table
| 1980 | 7.27B | 1996 | 17.5B | 2012 | 87.4B |
| 1981 | 8.85B | 1997 | 18.2B | 2013 | 89.9B |
| 1982 | 9.29B | 1998 | 16B | 2014 | 92.7B |
| 1983 | 9.73B | 1999 | 17.8B | 2015 | 78.7B |
| 1984 | 10.7B | 2000 | 22.3B | 2016 | 75.1B |
| 1985 | 11.9B | 2001 | 22.2B | 2017 | 80.9B |
| 1986 | 9.43B | 2002 | 23.1B | 2018 | 91.5B |
| 1987 | 9.89B | 2003 | 24.7B | 2019 | 88.1B |
| 1988 | 9.61B | 2004 | 28.4B | 2020 | 75.9B |
| 1989 | 10.7B | 2005 | 35.5B | 2021 | 87.3B |
| 1990 | 13.4B | 2006 | 42.6B | 2022 | 110B |
| 1991 | 13B | 2007 | 48.3B | 2023 | 106B |
| 1992 | 14.3B | 2008 | 69.8B | 2024 | 107B |
| 1993 | 14.3B | 2009 | 55.5B | 2025 | 106B |
| 1994 | 14.8B | 2010 | 65B | 2026 | 117B |
| 1995 | 15.8B | 2011 | 77.5B | | |
Show data table
| 1980 | 2.51B | 1996 | 6.73B | 2012 | 33.6B |
| 1981 | 3.06B | 1997 | 6.98B | 2013 | 34.6B |
| 1982 | 3.21B | 1998 | 6.17B | 2014 | 35.6B |
| 1983 | 3.36B | 1999 | 6.86B | 2015 | 30.3B |
| 1984 | 3.71B | 2000 | 8.56B | 2016 | 28.9B |
| 1985 | 4.12B | 2001 | 8.54B | 2017 | 31.1B |
| 1986 | 3.6B | 2002 | 8.87B | 2018 | 35.2B |
| 1987 | 3.8B | 2003 | 9.51B | 2019 | 33.9B |
| 1988 | 3.7B | 2004 | 10.9B | 2020 | 29.2B |
| 1989 | 4.13B | 2005 | 13.7B | 2021 | 33.6B |
| 1990 | 5.15B | 2006 | 16.4B | 2022 | 42.2B |
| 1991 | 5B | 2007 | 18.6B | 2023 | 40.8B |
| 1992 | 5.49B | 2008 | 26.8B | 2024 | 41.2B |
| 1993 | 5.51B | 2009 | 21.3B | 2025 | 40.8B |
| 1994 | 5.69B | 2010 | 25B | 2026 | 45.1B |
| 1995 | 6.08B | 2011 | 29.8B | | |
Show data table
| 1980 | 5.26B | 1996 | 16.4B | 2012 | 29.5B |
| 1981 | 6.16B | 1997 | 17.4B | 2013 | 31B |
| 1982 | 6.87B | 1998 | 17.8B | 2014 | 31.4B |
| 1983 | 7.96B | 1999 | 17.9B | 2015 | 33B |
| 1984 | 9.07B | 2000 | 19B | 2016 | 34.6B |
| 1985 | 10.4B | 2001 | 19.9B | 2017 | 34.7B |
| 1986 | 10.6B | 2002 | 19.7B | 2018 | 35.2B |
| 1987 | 10.2B | 2003 | 19.3B | 2019 | 34.8B |
| 1988 | 10.7B | 2004 | 19.7B | 2020 | 33.6B |
| 1989 | 11B | 2005 | 20.2B | 2021 | 34.5B |
| 1990 | 12B | 2006 | 21.2B | 2022 | 37.2B |
| 1991 | 12.7B | 2007 | 22.2B | 2023 | 37.8B |
| 1992 | 13.8B | 2008 | 24.2B | 2024 | 38.4B |
| 1993 | 14.6B | 2009 | 25.7B | 2025 | 39.3B |
| 1994 | 15.2B | 2010 | 26.3B | 2026 | 40.7B |
| 1995 | 15.9B | 2011 | 27.1B | | |