Show data table
| 1980 | 1.11B | 1996 | 2.66B | 2012 | 5.49B |
| 1981 | 1.22B | 1997 | 2.82B | 2013 | 5.66B |
| 1982 | 1.27B | 1998 | 3.23B | 2014 | 5.69B |
| 1983 | 1.35B | 1999 | 3.39B | 2015 | 5.7B |
| 1984 | 1.47B | 2000 | 3.5B | 2016 | 5.68B |
| 1985 | 1.54B | 2001 | 3.49B | 2017 | 5.85B |
| 1986 | 1.69B | 2002 | 3.55B | 2018 | 6B |
| 1987 | 1.87B | 2003 | 3.68B | 2019 | 6.17B |
| 1988 | 1.98B | 2004 | 3.97B | 2020 | 5.4B |
| 1989 | 2.2B | 2005 | 4.45B | 2021 | 5.95B |
| 1990 | 2.2B | 2006 | 4.97B | 2022 | 6.89B |
| 1991 | 2.21B | 2007 | 5.57B | 2023 | 7.22B |
| 1992 | 2.13B | 2008 | 5.71B | 2024 | 7.6B |
| 1993 | 2.26B | 2009 | 5.35B | 2025 | 8.02B |
| 1994 | 2.35B | 2010 | 5.43B | 2026 | 8.48B |
| 1995 | 2.48B | 2011 | 5.56B | | |
Show data table
| 1980 | 2.22B | 1996 | 5.32B | 2012 | 11B |
| 1981 | 2.44B | 1997 | 5.64B | 2013 | 11.3B |
| 1982 | 2.55B | 1998 | 6.46B | 2014 | 11.4B |
| 1983 | 2.7B | 1999 | 6.79B | 2015 | 11.4B |
| 1984 | 2.95B | 2000 | 7B | 2016 | 11.4B |
| 1985 | 3.09B | 2001 | 6.99B | 2017 | 11.7B |
| 1986 | 3.39B | 2002 | 7.11B | 2018 | 12B |
| 1987 | 3.73B | 2003 | 7.35B | 2019 | 12.3B |
| 1988 | 3.97B | 2004 | 7.93B | 2020 | 10.8B |
| 1989 | 4.39B | 2005 | 8.9B | 2021 | 11.9B |
| 1990 | 4.4B | 2006 | 9.94B | 2022 | 13.8B |
| 1991 | 4.42B | 2007 | 11.1B | 2023 | 14.4B |
| 1992 | 4.26B | 2008 | 11.4B | 2024 | 15.2B |
| 1993 | 4.52B | 2009 | 10.7B | 2025 | 16B |
| 1994 | 4.71B | 2010 | 10.9B | 2026 | 17B |
| 1995 | 4.96B | 2011 | 11.1B | | |
Show data table
| 1980 | 10.4B | 1996 | 11.3B | 2012 | 13.4B |
| 1981 | 10.2B | 1997 | 11.8B | 2013 | 13.4B |
| 1982 | 9.72B | 1998 | 12.3B | 2014 | 13.5B |
| 1983 | 9.77B | 1999 | 12.3B | 2015 | 13.4B |
| 1984 | 10.1B | 2000 | 12.9B | 2016 | 13.6B |
| 1985 | 10.2B | 2001 | 12.6B | 2017 | 13.7B |
| 1986 | 10.8B | 2002 | 12.7B | 2018 | 13.7B |
| 1987 | 11B | 2003 | 12.9B | 2019 | 13.7B |
| 1988 | 11.4B | 2004 | 13.1B | 2020 | 11.3B |
| 1989 | 11.8B | 2005 | 13.6B | 2021 | 12.2B |
| 1990 | 11.4B | 2006 | 14.4B | 2022 | 14.2B |
| 1991 | 11B | 2007 | 14.7B | 2023 | 14.4B |
| 1992 | 10.4B | 2008 | 14.8B | 2024 | 14.9B |
| 1993 | 10.4B | 2009 | 14.1B | 2025 | 15.3B |
| 1994 | 10.7B | 2010 | 13.8B | 2026 | 15.7B |
| 1995 | 10.9B | 2011 | 13.8B | | |