Show data table
| 1980 | 1.3B | 1996 | 2.31B | 2012 | 4.3B |
| 1981 | 1.34B | 1997 | 2.27B | 2013 | 4.54B |
| 1982 | 1.29B | 1998 | 1.8B | 2014 | 4.86B |
| 1983 | 1.22B | 1999 | 2.1B | 2015 | 4.68B |
| 1984 | 1.28B | 2000 | 1.82B | 2016 | 4.93B |
| 1985 | 1.24B | 2001 | 1.8B | 2017 | 5.35B |
| 1986 | 1.4B | 2002 | 2B | 2018 | 5.58B |
| 1987 | 1.28B | 2003 | 2.51B | 2019 | 5.35B |
| 1988 | 1.2B | 2004 | 2.95B | 2020 | 4.23B |
| 1989 | 1.28B | 2005 | 3.26B | 2021 | 4.16B |
| 1990 | 1.45B | 2006 | 3.36B | 2022 | 4.98B |
| 1991 | 1.5B | 2007 | 3.69B | 2023 | 5.48B |
| 1992 | 1.66B | 2008 | 3.82B | 2024 | 5.97B |
| 1993 | 1.77B | 2009 | 3.11B | 2025 | 6.04B |
| 1994 | 1.98B | 2010 | 3.4B | 2026 | 6.35B |
| 1995 | 2.13B | 2011 | 4.09B | | |
Show data table
| 1980 | 1.07B | 1996 | 3.24B | 2012 | 7.7B |
| 1981 | 1.14B | 1997 | 3.28B | 2013 | 8.36B |
| 1982 | 1.21B | 1998 | 3.57B | 2014 | 9.17B |
| 1983 | 1.24B | 1999 | 4.14B | 2015 | 9.82B |
| 1984 | 1.38B | 2000 | 3.88B | 2016 | 10.3B |
| 1985 | 1.43B | 2001 | 4.09B | 2017 | 11.1B |
| 1986 | 1.58B | 2002 | 4.37B | 2018 | 11.7B |
| 1987 | 1.59B | 2003 | 4.76B | 2019 | 11.5B |
| 1988 | 1.72B | 2004 | 5.12B | 2020 | 9.17B |
| 1989 | 1.9B | 2005 | 5.51B | 2021 | 8.61B |
| 1990 | 2.15B | 2006 | 5.82B | 2022 | 11B |
| 1991 | 2.21B | 2007 | 5.94B | 2023 | 12.3B |
| 1992 | 2.49B | 2008 | 6.08B | 2024 | 13.5B |
| 1993 | 2.73B | 2009 | 6.08B | 2025 | 13.8B |
| 1994 | 2.9B | 2010 | 6.53B | 2026 | 14.4B |
| 1995 | 3B | 2011 | 7.33B | | |
Show data table
| 1980 | 4.2B | 1996 | 6.6B | 2012 | 8.29B |
| 1981 | 4.45B | 1997 | 6.44B | 2013 | 8.68B |
| 1982 | 4.4B | 1998 | 6.52B | 2014 | 9.17B |
| 1983 | 4.22B | 1999 | 7.09B | 2015 | 9.58B |
| 1984 | 4.64B | 2000 | 6.97B | 2016 | 9.81B |
| 1985 | 4.47B | 2001 | 7.1B | 2017 | 10.3B |
| 1986 | 4.76B | 2002 | 7.33B | 2018 | 10.7B |
| 1987 | 4.42B | 2003 | 7.39B | 2019 | 11.5B |
| 1988 | 4.57B | 2004 | 7.78B | 2020 | 9.57B |
| 1989 | 5.21B | 2005 | 7.68B | 2021 | 9.15B |
| 1990 | 5.51B | 2006 | 7.83B | 2022 | 10.8B |
| 1991 | 5.36B | 2007 | 7.76B | 2023 | 11.8B |
| 1992 | 5.69B | 2008 | 7.84B | 2024 | 12.2B |
| 1993 | 5.84B | 2009 | 7.73B | 2025 | 12.6B |
| 1994 | 6.13B | 2010 | 7.96B | 2026 | 12.9B |
| 1995 | 6.29B | 2011 | 8.17B | | |