Show data table
| 1978 | 343M | 1994 | 595M | 2010 | 3.5B |
| 1979 | 505M | 1995 | 234M | 2011 | 3.64B |
| 1980 | 497M | 1996 | 160M | 2012 | 4.14B |
| 1981 | 619M | 1997 | 457M | 2013 | 6.09B |
| 1982 | 668M | 1998 | 170M | 2014 | 6.85B |
| 1983 | 779M | 1999 | 1.07B | 2015 | 3.61B |
| 1984 | 1.07B | 2000 | 584M | 2016 | 2.76B |
| 1985 | 1.15B | 2001 | 404M | 2017 | 3.06B |
| 1986 | 1.16B | 2002 | 439M | 2018 | 1.98B |
| 1987 | 1.49B | 2003 | 670M | 2019 | 1.47B |
| 1988 | 1.47B | 2004 | 818M | 2020 | 992M |
| 1989 | 1.95B | 2005 | 1.37B | 2021 | 974M |
| 1990 | 1.75B | 2006 | 1.97B | 2022 | 1.62B |
| 1991 | 1.03B | 2007 | 2.03B | 2023 | 1.25B |
| 1992 | 794M | 2008 | 3.16B | 2024 | 924M |
| 1993 | 1.77B | 2009 | 3.31B | 2025 | 1.46B |
Show data table
| 1985 | 0% | 1999 | 17.3% | 2013 | 4.5% |
| 1986 | 0% | 2000 | 6.4% | 2014 | 4.7% |
| 1987 | 22.2% | 2001 | 4.5% | 2015 | 3.1% |
| 1988 | 22% | 2002 | 2.9% | 2016 | 2.7% |
| 1989 | 19.4% | 2003 | 3.8% | 2017 | 2.5% |
| 1990 | 17.5% | 2004 | 3.5% | 2018 | 2% |
| 1991 | 7.1% | 2005 | 3.7% | 2019 | 1.8% |
| 1992 | 5.7% | 2006 | 3.8% | 2020 | 1.8% |
| 1993 | 17.5% | 2007 | 3.1% | 2021 | 1.4% |
| 1994 | 5.7% | 2008 | 3.6% | 2022 | 1.4% |
| 1995 | 4.7% | 2009 | 4.7% | 2023 | 1.4% |
| 1996 | 2.4% | 2010 | 4.2% | 2024 | 1% |
| 1997 | 6% | 2011 | 3.3% | 2025 | 1.4% |
| 1998 | 2.6% | 2012 | 3.2% | | |