Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 1991 | 4.820 | 4.450 | 4.613 |
| 1992 | 4.940 | 4.500 | 4.690 |
| 1993 | 4.716 | 4.206 | 4.503 |
| 1994 | 4.678 | 4.412 | 4.528 |
| 1995 | 4.824 | 4.572 | 4.736 |
| 1996 | 4.807 | 4.545 | 4.684 |
| 1997 | 5.212 | 4.374 | 4.798 |
| 1998 | 5.179 | 4.524 | 4.814 |
| 1999 | 5.195 | 4.684 | 4.959 |
| 2000 | 4.969 | 4.586 | 4.778 |
| 2001 | 4.762 | 4.227 | 4.571 |
| 2002 | 4.357 | 3.900 | 4.146 |
| 2003 | 4.427 | 4.194 | 4.286 |
| 2004 | 4.473 | 4.087 | 4.288 |
| 2005 | 4.103 | 3.870 | 3.996 |
| 2006 | 3.893 | 3.679 | 3.799 |
| 2007 | 3.867 | 3.486 | 3.725 |
| 2008 | 3.615 | 3.079 | 3.349 |
| 2009 | 3.955 | 3.371 | 3.545 |
| 2010 | 3.556 | 3.274 | 3.398 |
| 2011 | 3.499 | 3.221 | 3.300 |
| 2012 | 3.484 | 3.372 | 3.427 |