데이터 표
| 1978 | 3.43억 | 1994 | 5.95억 | 2010 | 35억 |
| 1979 | 5.05억 | 1995 | 2.34억 | 2011 | 36.4억 |
| 1980 | 4.97억 | 1996 | 1.6억 | 2012 | 41.4억 |
| 1981 | 6.19억 | 1997 | 4.57억 | 2013 | 60.9억 |
| 1982 | 6.68억 | 1998 | 1.7억 | 2014 | 68.5억 |
| 1983 | 7.79억 | 1999 | 10.7억 | 2015 | 36.1억 |
| 1984 | 10.7억 | 2000 | 5.84억 | 2016 | 27.6억 |
| 1985 | 11.5억 | 2001 | 4.04억 | 2017 | 30.6억 |
| 1986 | 11.6억 | 2002 | 4.39억 | 2018 | 19.8억 |
| 1987 | 14.9억 | 2003 | 6.7억 | 2019 | 14.7억 |
| 1988 | 14.7억 | 2004 | 8.18억 | 2020 | 9.92억 |
| 1989 | 19.5억 | 2005 | 13.7억 | 2021 | 9.74억 |
| 1990 | 17.5억 | 2006 | 19.7억 | 2022 | 16.2억 |
| 1991 | 10.3억 | 2007 | 20.3억 | 2023 | 12.5억 |
| 1992 | 7.94억 | 2008 | 31.6억 | 2024 | 9.24억 |
| 1993 | 17.7억 | 2009 | 33.1억 | 2025 | 14.6억 |
데이터 표
| 1985 | 0% | 1999 | 17.3% | 2013 | 4.5% |
| 1986 | 0% | 2000 | 6.4% | 2014 | 4.7% |
| 1987 | 22.3% | 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% | | |