Tabella dei dati
| 1990 | 24,3% | 1997 | 27,2% | 2004 | 27,1% |
| 1991 | 27,7% | 1998 | 26% | 2005 | 23,8% |
| 1992 | 26,9% | 1999 | 26,6% | 2006 | 25,2% |
| 1993 | 24,4% | 2000 | 26% | 2007 | 22,7% |
| 1994 | 24,3% | 2001 | 30,3% | 2008 | 20,1% |
| 1995 | 25,9% | 2002 | 26,5% | 2009 | 23,9% |
| 1996 | 24,9% | 2003 | 29,9% | 2010 | 20,8% |
Tabella dei dati
| 1990 | 65,3 mld | 1997 | 203 mld | 2004 | 344 mld |
| 1991 | 86,3 mld | 1998 | 206 mld | 2005 | 358 mld |
| 1992 | 100 mld | 1999 | 217 mld | 2006 | 435 mld |
| 1993 | 101 mld | 2000 | 246 mld | 2007 | 459 mld |
| 1994 | 123 mld | 2001 | 306 mld | 2008 | 491 mld |
| 1995 | 148 mld | 2002 | 296 mld | 2009 | 601 mld |
| 1996 | 172 mld | 2003 | 322 mld | 2010 | 582 mld |
Tabella dei dati
| 1990 | 28,3% | 1997 | 29% | 2004 | 31,3% |
| 1991 | 34,3% | 1998 | 28,8% | 2005 | 28,2% |
| 1992 | 34,2% | 1999 | 28% | 2006 | 26,3% |
| 1993 | 29,4% | 2000 | 27,4% | 2007 | 25,7% |
| 1994 | 30,3% | 2001 | 28% | 2008 | 22,9% |
| 1995 | 29,8% | 2002 | 28,5% | 2009 | 26,7% |
| 1996 | 27,7% | 2003 | 32,6% | 2010 | 28,6% |
Tabella dei dati
| 1990 | 75,8 mld | 1997 | 216 mld | 2004 | 397 mld |
| 1991 | 107 mld | 1998 | 228 mld | 2005 | 424 mld |
| 1992 | 127 mld | 1999 | 230 mld | 2006 | 455 mld |
| 1993 | 122 mld | 2000 | 259 mld | 2007 | 519 mld |
| 1994 | 153 mld | 2001 | 283 mld | 2008 | 561 mld |
| 1995 | 170 mld | 2002 | 318 mld | 2009 | 674 mld |
| 1996 | 191 mld | 2003 | 351 mld | 2010 | 800 mld |