Show data table
| 1980 | 4.09B | 1996 | 7.61B | 2012 | 21.3B |
| 1981 | 4.01B | 1997 | 7.27B | 2013 | 21.3B |
| 1982 | 3.81B | 1998 | 5.56B | 2014 | 23.2B |
| 1983 | 3.8B | 1999 | 5.07B | 2015 | 21.7B |
| 1984 | 3.51B | 2000 | 5.17B | 2016 | 20.8B |
| 1985 | 3.25B | 2001 | 4.53B | 2017 | 22.7B |
| 1986 | 3.54B | 2002 | 4.39B | 2018 | 24.1B |
| 1987 | 3.89B | 2003 | 5.49B | 2019 | 24.8B |
| 1988 | 5.4B | 2004 | 6.28B | 2020 | 23.8B |
| 1989 | 5.24B | 2005 | 7.34B | 2021 | 26.1B |
| 1990 | 4.76B | 2006 | 8.36B | 2022 | 31.7B |
| 1991 | 5.6B | 2007 | 9.54B | 2023 | 30.7B |
| 1992 | 6.47B | 2008 | 11.7B | 2024 | 30.8B |
| 1993 | 7.35B | 2009 | 11.6B | 2025 | 32.5B |
| 1994 | 8.08B | 2010 | 14.3B | 2026 | 34.4B |
| 1995 | 7.15B | 2011 | 18B | | |
Show data table
| 1980 | 2.74B | 1996 | 10B | 2012 | 44.4B |
| 1981 | 2.7B | 1997 | 10.5B | 2013 | 47.7B |
| 1982 | 2.81B | 1998 | 11.5B | 2014 | 57.1B |
| 1983 | 3.17B | 1999 | 13B | 2015 | 60.1B |
| 1984 | 3.14B | 2000 | 14.4B | 2016 | 65B |
| 1985 | 3.25B | 2001 | 15.4B | 2017 | 72.5B |
| 1986 | 3.43B | 2002 | 17.1B | 2018 | 79.4B |
| 1987 | 3.53B | 2003 | 19.6B | 2019 | 83.8B |
| 1988 | 4.68B | 2004 | 20.2B | 2020 | 82.5B |
| 1989 | 4.5B | 2005 | 22.8B | 2021 | 91.6B |
| 1990 | 4.54B | 2006 | 25.5B | 2022 | 111B |
| 1991 | 5.33B | 2007 | 28.3B | 2023 | 111B |
| 1992 | 6.24B | 2008 | 31.5B | 2024 | 119B |
| 1993 | 7.19B | 2009 | 32B | 2025 | 134B |
| 1994 | 8.17B | 2010 | 38.8B | 2026 | 148B |
| 1995 | 9.15B | 2011 | 42.6B | | |
Show data table
| 1980 | 16.3B | 1996 | 30.2B | 2012 | 46B |
| 1981 | 16.5B | 1997 | 28.3B | 2013 | 47.7B |
| 1982 | 16.6B | 1998 | 29.6B | 2014 | 54.2B |
| 1983 | 17.2B | 1999 | 30.1B | 2015 | 57.7B |
| 1984 | 17B | 2000 | 29.4B | 2016 | 60.9B |
| 1985 | 17.6B | 2001 | 29.4B | 2017 | 63.1B |
| 1986 | 18.6B | 2002 | 29.3B | 2018 | 62.9B |
| 1987 | 19.1B | 2003 | 32B | 2019 | 65.7B |
| 1988 | 19.7B | 2004 | 32.1B | 2020 | 63.6B |
| 1989 | 19.4B | 2005 | 33.5B | 2021 | 63.3B |
| 1990 | 18.8B | 2006 | 34.4B | 2022 | 66.9B |
| 1991 | 20.6B | 2007 | 37B | 2023 | 69.5B |
| 1992 | 23.4B | 2008 | 36.9B | 2024 | 72.2B |
| 1993 | 26.5B | 2009 | 39.4B | 2025 | 76.2B |
| 1994 | 29.3B | 2010 | 43.4B | 2026 | 79.1B |
| 1995 | 28.3B | 2011 | 43.9B | | |