Show data table
| 1980 | 9.57B | 1996 | 22.3B | 2012 | 47.3B |
| 1981 | 9.22B | 1997 | 21.8B | 2013 | 48.7B |
| 1982 | 8.9B | 1998 | 22.9B | 2014 | 50.3B |
| 1983 | 9.2B | 1999 | 24.1B | 2015 | 45.8B |
| 1984 | 9.05B | 2000 | 22.5B | 2016 | 44.4B |
| 1985 | 9.25B | 2001 | 23.1B | 2017 | 42.2B |
| 1986 | 9.91B | 2002 | 24.3B | 2018 | 42.7B |
| 1987 | 10.7B | 2003 | 28.8B | 2019 | 41.9B |
| 1988 | 11.1B | 2004 | 32.7B | 2020 | 42.5B |
| 1989 | 11.1B | 2005 | 33.9B | 2021 | 46.8B |
| 1990 | 14.1B | 2006 | 36.1B | 2022 | 44.6B |
| 1991 | 14.9B | 2007 | 40.8B | 2023 | 48.5B |
| 1992 | 17.8B | 2008 | 47B | 2024 | 51.3B |
| 1993 | 16.7B | 2009 | 45.6B | 2025 | 57.6B |
| 1994 | 17.9B | 2010 | 46.2B | 2026 | 60.7B |
| 1995 | 20.6B | 2011 | 48.1B | | |
Show data table
| 1980 | 3.87B | 1996 | 21.7B | 2012 | 73.9B |
| 1981 | 4.55B | 1997 | 24.1B | 2013 | 79.1B |
| 1982 | 5.26B | 1998 | 26B | 2014 | 85.3B |
| 1983 | 6.25B | 1999 | 28.5B | 2015 | 89.8B |
| 1984 | 7.03B | 2000 | 30.9B | 2016 | 95.3B |
| 1985 | 7.72B | 2001 | 33.3B | 2017 | 102B |
| 1986 | 7.87B | 2002 | 34.5B | 2018 | 113B |
| 1987 | 8.84B | 2003 | 37.1B | 2019 | 123B |
| 1988 | 9.5B | 2004 | 40.7B | 2020 | 120B |
| 1989 | 10.5B | 2005 | 43.9B | 2021 | 131B |
| 1990 | 12.4B | 2006 | 48B | 2022 | 138B |
| 1991 | 13.8B | 2007 | 52.3B | 2023 | 151B |
| 1992 | 15.8B | 2008 | 58B | 2024 | 160B |
| 1993 | 16.8B | 2009 | 61.5B | 2025 | 173B |
| 1994 | 18.1B | 2010 | 66.1B | 2026 | 186B |
| 1995 | 19.5B | 2011 | 67.7B | | |
Show data table
| 1980 | 23.9B | 1996 | 44.5B | 2012 | 84.2B |
| 1981 | 25.2B | 1997 | 47B | 2013 | 86.3B |
| 1982 | 25.1B | 1998 | 49.4B | 2014 | 88.9B |
| 1983 | 26.3B | 1999 | 52.3B | 2015 | 89.8B |
| 1984 | 27.8B | 2000 | 54.6B | 2016 | 90.8B |
| 1985 | 29.4B | 2001 | 56.7B | 2017 | 92.9B |
| 1986 | 28.9B | 2002 | 57.4B | 2018 | 95.3B |
| 1987 | 30.9B | 2003 | 60.1B | 2019 | 96.7B |
| 1988 | 30.9B | 2004 | 63.9B | 2020 | 88.1B |
| 1989 | 31.7B | 2005 | 66.1B | 2021 | 92.2B |
| 1990 | 33.9B | 2006 | 69.5B | 2022 | 94.7B |
| 1991 | 35.4B | 2007 | 74.2B | 2023 | 94.9B |
| 1992 | 38.2B | 2008 | 77.4B | 2024 | 96.5B |
| 1993 | 39.1B | 2009 | 79.7B | 2025 | 98.9B |
| 1994 | 40.5B | 2010 | 82.5B | 2026 | 101B |
| 1995 | 41.6B | 2011 | 80.8B | | |