Tabel data
| 1981 | 2,71 miliar | 1997 | 1,21 miliar | 2013 | 3,78 miliar |
| 1982 | 2,76 miliar | 1998 | 752 juta | 2014 | 5,25 miliar |
| 1983 | 2,53 miliar | 1999 | 1,55 miliar | 2015 | 2,16 miliar |
| 1984 | 2,92 miliar | 2000 | 3 miliar | 2016 | 1,47 miliar |
| 1985 | 3,16 miliar | 2001 | 1,95 miliar | 2017 | 1,98 miliar |
| 1986 | 1,99 miliar | 2002 | 1,76 miliar | 2018 | 940 juta |
| 1987 | 2,27 miliar | 2003 | 2,48 miliar | 2019 | 894 juta |
| 1988 | 2,25 miliar | 2004 | 2,88 miliar | 2020 | 514 juta |
| 1989 | 2,15 miliar | 2005 | 4,03 miliar | 2021 | 1,56 miliar |
| 1990 | 2,36 miliar | 2006 | 5,23 miliar | 2022 | 3,26 miliar |
| 1991 | 2,47 miliar | 2007 | 4,83 miliar | 2023 | 1,94 miliar |
| 1992 | 1,81 miliar | 2008 | 6,94 miliar | 2024 | 2,23 miliar |
| 1993 | 1,23 miliar | 2009 | 3,98 miliar | 2025 | 2,19 miliar |
| 1994 | 1,59 miliar | 2010 | 5,02 miliar | 2026 | 2,44 miliar |
| 1995 | 1,15 miliar | 2011 | 6,43 miliar | | |
| 1996 | 1,35 miliar | 2012 | 5,68 miliar | | |
Tabel data
| 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% |