Tableau de données
| 1990 | 71,6% | 2003 | 81,6% | 2016 | 40,6% |
| 1991 | 70,9% | 2004 | 86,9% | 2017 | 39,9% |
| 1992 | 62% | 2005 | 97,9% | 2018 | 37,5% |
| 1993 | 68,9% | 2006 | 95,2% | 2019 | 37,3% |
| 1994 | 71,3% | 2007 | 60,8% | 2020 | 45,3% |
| 1995 | 66,5% | 2008 | 58,5% | 2021 | 40,6% |
| 1996 | 67,7% | 2009 | 61,3% | 2022 | 37,2% |
| 1997 | 67,9% | 2010 | 71,1% | 2023 | 39,8% |
| 1998 | 75,9% | 2011 | 53,9% | 2024 | 48,3% |
| 1999 | 92,3% | 2012 | 26,9% | 2025 | 48,1% |
| 2000 | 91,5% | 2013 | 30,5% | 2026 | 44,7% |
| 2001 | 90,4% | 2014 | 32,1% | | |
| 2002 | 82,6% | 2015 | 41,5% | | |
Tableau de données
| 1990 | 1,75 Bn | 2003 | 7,71 Bn | 2016 | 31,33 Bn |
| 1991 | 2,24 Bn | 2004 | 9,77 Bn | 2017 | 37,44 Bn |
| 1992 | 2,56 Bn | 2005 | 16,08 Bn | 2018 | 40,03 Bn |
| 1993 | 3 Bn | 2006 | 20,69 Bn | 2019 | 46,09 Bn |
| 1994 | 3,28 Bn | 2007 | 16,03 Bn | 2020 | 60,99 Bn |
| 1995 | 3,39 Bn | 2008 | 18,74 Bn | 2021 | 64,64 Bn |
| 1996 | 3,61 Bn | 2009 | 19,78 Bn | 2022 | 63,44 Bn |
| 1997 | 3,87 Bn | 2010 | 27,92 Bn | 2023 | 76,02 Bn |
| 1998 | 4,7 Bn | 2011 | 24,33 Bn | 2024 | 100,84 Bn |
| 1999 | 6,14 Bn | 2012 | 13,86 Bn | 2025 | 112,39 Bn |
| 2000 | 6,46 Bn | 2013 | 17,67 Bn | 2026 | 118,83 Bn |
| 2001 | 6,71 Bn | 2014 | 19,75 Bn | | |
| 2002 | 6,57 Bn | 2015 | 27,34 Bn | | |