Show data table
| 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% |
Show data table
| 1990 | 65.3B | 1997 | 203B | 2004 | 344B |
| 1991 | 86.3B | 1998 | 206B | 2005 | 358B |
| 1992 | 100B | 1999 | 217B | 2006 | 435B |
| 1993 | 101B | 2000 | 246B | 2007 | 459B |
| 1994 | 123B | 2001 | 306B | 2008 | 491B |
| 1995 | 148B | 2002 | 296B | 2009 | 601B |
| 1996 | 172B | 2003 | 322B | 2010 | 582B |
Show data table
| 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% |
Show data table
| 1990 | 75.8B | 1997 | 216B | 2004 | 397B |
| 1991 | 107B | 1998 | 228B | 2005 | 424B |
| 1992 | 127B | 1999 | 230B | 2006 | 455B |
| 1993 | 122B | 2000 | 259B | 2007 | 519B |
| 1994 | 153B | 2001 | 283B | 2008 | 561B |
| 1995 | 170B | 2002 | 318B | 2009 | 674B |
| 1996 | 191B | 2003 | 351B | 2010 | 800B |