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| 1997 | 84,2% | 2007 | 53,5% | 2017 | 32,6% |
| 1998 | 75,2% | 2008 | 51,2% | 2018 | 35,3% |
| 1999 | 78% | 2009 | 46,5% | 2019 | 37,2% |
| 2000 | 74% | 2010 | 45,6% | 2020 | 46,3% |
| 2001 | 71,2% | 2011 | 50% | 2021 | 50,2% |
| 2002 | 63% | 2012 | 24,7% | 2022 | 56% |
| 2003 | 56,4% | 2013 | 24,6% | 2023 | 56,7% |
| 2004 | 56,7% | 2014 | 26,7% | 2024 | 59,5% |
| 2005 | 58,2% | 2015 | 29,2% | 2025 | 56,3% |
| 2006 | 57,5% | 2016 | 31,1% | 2026 | 55,1% |
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| 1997 | 7,96 bill. | 2007 | 7,21 bill. | 2017 | 9,94 bill. |
| 1998 | 7,73 bill. | 2008 | 7,68 bill. | 2018 | 11,48 bill. |
| 1999 | 8,22 bill. | 2009 | 7,36 bill. | 2019 | 13,17 bill. |
| 2000 | 7,8 bill. | 2010 | 7,77 bill. | 2020 | 16,8 bill. |
| 2001 | 8,07 bill. | 2011 | 8,38 bill. | 2021 | 20,25 bill. |
| 2002 | 7,49 bill. | 2012 | 4,67 bill. | 2022 | 24,79 bill. |
| 2003 | 6,93 bill. | 2013 | 5,26 bill. | 2023 | 27,78 bill. |
| 2004 | 6,86 bill. | 2014 | 6,45 bill. | 2024 | 31,41 bill. |
| 2005 | 7,25 bill. | 2015 | 7,9 bill. | 2025 | 32,35 bill. |
| 2006 | 7,39 bill. | 2016 | 8,93 bill. | 2026 | 34,34 bill. |