Show data table
| 1980 | 2.6B | 1996 | 5.95B | 2012 | 10.7B |
| 1981 | 2.69B | 1997 | 6.33B | 2013 | 10.5B |
| 1982 | 3.03B | 1998 | 6.83B | 2014 | 11.1B |
| 1983 | 3.37B | 1999 | 7.68B | 2015 | 11.8B |
| 1984 | 3.6B | 2000 | 8.08B | 2016 | 11.9B |
| 1985 | 3.92B | 2001 | 8.32B | 2017 | 12.4B |
| 1986 | 4.24B | 2002 | 8.88B | 2018 | 12.8B |
| 1987 | 4.67B | 2003 | 8.87B | 2019 | 13.3B |
| 1988 | 4.86B | 2004 | 9.05B | 2020 | 10.4B |
| 1989 | 5.47B | 2005 | 9.84B | 2021 | 12B |
| 1990 | 5.22B | 2006 | 10.2B | 2022 | 13.9B |
| 1991 | 5.13B | 2007 | 10.6B | 2023 | 15.3B |
| 1992 | 5.12B | 2008 | 10.5B | 2024 | 15.8B |
| 1993 | 5.1B | 2009 | 9.98B | 2025 | 16.5B |
| 1994 | 5.37B | 2010 | 10.1B | 2026 | 17B |
| 1995 | 5.65B | 2011 | 10.1B | | |
Show data table
| 1980 | 2.6B | 1996 | 5.95B | 2012 | 10.7B |
| 1981 | 2.69B | 1997 | 6.33B | 2013 | 10.5B |
| 1982 | 3.03B | 1998 | 6.83B | 2014 | 11.1B |
| 1983 | 3.37B | 1999 | 7.68B | 2015 | 11.8B |
| 1984 | 3.6B | 2000 | 8.08B | 2016 | 11.9B |
| 1985 | 3.92B | 2001 | 8.32B | 2017 | 12.4B |
| 1986 | 4.24B | 2002 | 8.88B | 2018 | 12.8B |
| 1987 | 4.67B | 2003 | 8.87B | 2019 | 13.3B |
| 1988 | 4.86B | 2004 | 9.05B | 2020 | 10.4B |
| 1989 | 5.47B | 2005 | 9.84B | 2021 | 12B |
| 1990 | 5.22B | 2006 | 10.2B | 2022 | 13.9B |
| 1991 | 5.13B | 2007 | 10.6B | 2023 | 15.3B |
| 1992 | 5.12B | 2008 | 10.5B | 2024 | 15.8B |
| 1993 | 5.1B | 2009 | 9.98B | 2025 | 16.5B |
| 1994 | 5.37B | 2010 | 10.1B | 2026 | 17B |
| 1995 | 5.65B | 2011 | 10.1B | | |
Show data table
| 1980 | 6.46B | 1996 | 8.86B | 2012 | 12.3B |
| 1981 | 6.27B | 1997 | 9.29B | 2013 | 11.9B |
| 1982 | 6.67B | 1998 | 9.73B | 2014 | 12.1B |
| 1983 | 7.12B | 1999 | 10.4B | 2015 | 12.3B |
| 1984 | 7.29B | 2000 | 10.9B | 2016 | 12.1B |
| 1985 | 7.59B | 2001 | 11.1B | 2017 | 12.5B |
| 1986 | 7.79B | 2002 | 11.4B | 2018 | 12.8B |
| 1987 | 8.08B | 2003 | 11.3B | 2019 | 12.7B |
| 1988 | 8.26B | 2004 | 11.4B | 2020 | 10.2B |
| 1989 | 8.45B | 2005 | 11.8B | 2021 | 11.9B |
| 1990 | 8.54B | 2006 | 12.1B | 2022 | 13.2B |
| 1991 | 8.18B | 2007 | 12.3B | 2023 | 13.6B |
| 1992 | 7.87B | 2008 | 12B | 2024 | 14.1B |
| 1993 | 7.89B | 2009 | 11.5B | 2025 | 14.5B |
| 1994 | 8.14B | 2010 | 11.7B | 2026 | 14.8B |
| 1995 | 8.5B | 2011 | 11.7B | | |