Show data table
| 1980 | 4.34B | 1996 | 7.79B | 2012 | 34.9B |
| 1981 | 4.88B | 1997 | 8.16B | 2013 | 37.9B |
| 1982 | 5.21B | 1998 | 9.02B | 2014 | 40.6B |
| 1983 | 5.47B | 1999 | 9.29B | 2015 | 42.5B |
| 1984 | 5.53B | 2000 | 9.64B | 2016 | 43.8B |
| 1985 | 5.56B | 2001 | 10.2B | 2017 | 45.6B |
| 1986 | 7.12B | 2002 | 11B | 2018 | 47.5B |
| 1987 | 7.5B | 2003 | 11.7B | 2019 | 48.7B |
| 1988 | 7.03B | 2004 | 13B | 2020 | 48B |
| 1989 | 4.73B | 2005 | 14.5B | 2021 | 50.8B |
| 1990 | 4.62B | 2006 | 17.4B | 2022 | 53.6B |
| 1991 | 4.83B | 2007 | 19.8B | 2023 | 56.2B |
| 1992 | 5.97B | 2008 | 25.6B | 2024 | 58.7B |
| 1993 | 6.2B | 2009 | 27.5B | 2025 | 61.7B |
| 1994 | 6.98B | 2010 | 30.2B | 2026 | 64.9B |
| 1995 | 7.47B | 2011 | 32.6B | | |
Show data table
| 1980 | 1.3B | 1996 | 5.53B | 2012 | 24.7B |
| 1981 | 1.61B | 1997 | 5.79B | 2013 | 26.9B |
| 1982 | 1.83B | 1998 | 6.39B | 2014 | 28.8B |
| 1983 | 1.99B | 1999 | 6.59B | 2015 | 30.1B |
| 1984 | 2.12B | 2000 | 6.83B | 2016 | 31B |
| 1985 | 2.19B | 2001 | 7.26B | 2017 | 32.3B |
| 1986 | 2.49B | 2002 | 7.81B | 2018 | 33.7B |
| 1987 | 2.54B | 2003 | 8.28B | 2019 | 34.5B |
| 1988 | 2.61B | 2004 | 9.22B | 2020 | 34B |
| 1989 | 2.7B | 2005 | 10.3B | 2021 | 36B |
| 1990 | 3.07B | 2006 | 12.4B | 2022 | 38B |
| 1991 | 3.29B | 2007 | 14.1B | 2023 | 39.8B |
| 1992 | 4.06B | 2008 | 18.2B | 2024 | 41.6B |
| 1993 | 4.36B | 2009 | 19.5B | 2025 | 43.7B |
| 1994 | 4.91B | 2010 | 21.4B | 2026 | 46B |
| 1995 | 5.29B | 2011 | 23.2B | | |
Show data table
| 1980 | 8.21B | 1996 | 13.6B | 2012 | 31B |
| 1981 | 9.45B | 1997 | 14.1B | 2013 | 31.9B |
| 1982 | 10B | 1998 | 14.5B | 2014 | 32.9B |
| 1983 | 10.1B | 1999 | 15B | 2015 | 33.8B |
| 1984 | 10.7B | 2000 | 15.6B | 2016 | 34.5B |
| 1985 | 10.6B | 2001 | 16.4B | 2017 | 35.3B |
| 1986 | 11.2B | 2002 | 17.5B | 2018 | 36B |
| 1987 | 11.5B | 2003 | 18.2B | 2019 | 36.7B |
| 1988 | 11.8B | 2004 | 19.7B | 2020 | 36.2B |
| 1989 | 10.6B | 2005 | 21.4B | 2021 | 37.6B |
| 1990 | 10.4B | 2006 | 23.3B | 2022 | 38.6B |
| 1991 | 9.82B | 2007 | 25.2B | 2023 | 39.8B |
| 1992 | 11.5B | 2008 | 27.3B | 2024 | 40.9B |
| 1993 | 12B | 2009 | 28.7B | 2025 | 42B |
| 1994 | 12.6B | 2010 | 29.4B | 2026 | 43.1B |
| 1995 | 13.3B | 2011 | 30.3B | | |