Tabella dei dati
| 1988 | 159,7% | 2001 | 85,5% | 2014 | 68,2% |
| 1989 | 190,3% | 2002 | 85,9% | 2015 | 71,4% |
| 1990 | 197,7% | 2003 | 80,4% | 2016 | 70,7% |
| 1991 | 180,5% | 2004 | 73,8% | 2017 | 69,1% |
| 1992 | 134,7% | 2005 | 66,1% | 2018 | 67,9% |
| 1993 | 122,2% | 2006 | 60% | 2019 | 69,4% |
| 1994 | 112,1% | 2007 | 58,2% | 2020 | 77,9% |
| 1995 | 102,4% | 2008 | 47,9% | 2021 | 79,9% |
| 1996 | 101,2% | 2009 | 51,8% | 2022 | 80,7% |
| 1997 | 94,7% | 2010 | 53,4% | 2023 | 81% |
| 1998 | 96,3% | 2011 | 56,1% | 2024 | 82,1% |
| 1999 | 98,7% | 2012 | 64% | 2025 | 82,8% |
| 2000 | 89,9% | 2013 | 68,8% | 2026 | 81,8% |
Tabella dei dati
| 1988 | 4,17 mld | 2001 | 6,2 mld | 2014 | 19,6 mld |
| 1989 | 5,13 mld | 2002 | 6,71 mld | 2015 | 21,5 mld |
| 1990 | 6,07 mld | 2003 | 6,66 mld | 2016 | 21,9 mld |
| 1991 | 5,94 mld | 2004 | 6,8 mld | 2017 | 22,4 mld |
| 1992 | 5,47 mld | 2005 | 6,79 mld | 2018 | 22,9 mld |
| 1993 | 5,32 mld | 2006 | 7,43 mld | 2019 | 24 mld |
| 1994 | 5,5 mld | 2007 | 8,18 mld | 2020 | 26,5 mld |
| 1995 | 5,42 mld | 2008 | 8,72 mld | 2021 | 28,8 mld |
| 1996 | 5,59 mld | 2009 | 10,1 mld | 2022 | 30,7 mld |
| 1997 | 5,48 mld | 2010 | 11,5 mld | 2023 | 32,3 mld |
| 1998 | 6,15 mld | 2011 | 13 mld | 2024 | 34,2 mld |
| 1999 | 6,5 mld | 2012 | 15,8 mld | 2025 | 36,2 mld |
| 2000 | 6,14 mld | 2013 | 18,5 mld | 2026 | 37,6 mld |