Show data table
| 1981 | 2.71B | 1997 | 1.21B | 2013 | 3.78B |
| 1982 | 2.76B | 1998 | 752M | 2014 | 5.25B |
| 1983 | 2.53B | 1999 | 1.55B | 2015 | 2.16B |
| 1984 | 2.92B | 2000 | 3B | 2016 | 1.47B |
| 1985 | 3.16B | 2001 | 1.95B | 2017 | 1.98B |
| 1986 | 1.99B | 2002 | 1.76B | 2018 | 940M |
| 1987 | 2.27B | 2003 | 2.48B | 2019 | 894M |
| 1988 | 2.25B | 2004 | 2.88B | 2020 | 514M |
| 1989 | 2.15B | 2005 | 4.03B | 2021 | 1.56B |
| 1990 | 2.35B | 2006 | 5.23B | 2022 | 3.26B |
| 1991 | 2.47B | 2007 | 4.83B | 2023 | 1.94B |
| 1992 | 1.81B | 2008 | 6.94B | 2024 | 2.23B |
| 1993 | 1.23B | 2009 | 3.98B | 2025 | 2.19B |
| 1994 | 1.59B | 2010 | 5.02B | 2026 | 2.44B |
| 1995 | 1.15B | 2011 | 6.43B | | |
| 1996 | 1.35B | 2012 | 5.68B | | |
Show data table
| 1985 | 65.4% | 1999 | 26.7% | 2013 | 20.9% |
| 1986 | 60.6% | 2000 | 45.1% | 2014 | 30.7% |
| 1987 | 58.5% | 2001 | 31.4% | 2015 | 16.7% |
| 1988 | 60.9% | 2002 | 27.1% | 2016 | 12.9% |
| 1989 | 52.4% | 2003 | 34.2% | 2017 | 16.4% |
| 1990 | 47.8% | 2004 | 33% | 2018 | 6.9% |
| 1991 | 46.9% | 2005 | 38.2% | 2019 | 6.6% |
| 1992 | 32.7% | 2006 | 41.1% | 2020 | 4.3% |
| 1993 | 21.9% | 2007 | 35.6% | 2021 | 11.1% |
| 1994 | 26.5% | 2008 | 43.5% | 2022 | 19.5% |
| 1995 | 16.1% | 2009 | 33.4% | 2023 | 12.9% |
| 1996 | 18.8% | 2010 | 36.6% | 2024 | 14.5% |
| 1997 | 17.2% | 2011 | 34.7% | 2025 | 13.7% |
| 1998 | 14% | 2012 | 29.8% | 2026 | 14.5% |