Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 1991 | 41.790 | 38.910 | 40.293 |
| 1992 | 40.570 | 38.696 | 39.786 |
| 1993 | 41.903 | 38.721 | 40.512 |
| 1994 | 41.898 | 40.358 | 41.178 |
| 1995 | 41.763 | 38.932 | 40.241 |
| 1996 | 40.413 | 37.976 | 39.416 |
| 1997 | 48.043 | 38.391 | 43.625 |
| 1998 | 48.198 | 40.132 | 43.730 |
| 1999 | 49.413 | 41.624 | 47.261 |
| 2000 | 53.810 | 47.715 | 50.899 |
| 2001 | 50.575 | 44.267 | 48.426 |
| 2002 | 46.121 | 38.754 | 42.285 |
| 2003 | 41.366 | 37.482 | 39.471 |
| 2004 | 40.266 | 34.610 | 38.036 |
| 2005 | 36.742 | 33.807 | 35.373 |
| 2006 | 35.143 | 31.302 | 33.219 |
| 2007 | 32.538 | 27.925 | 31.032 |
| 2008 | 30.340 | 23.650 | 26.940 |
| 2009 | 34.797 | 27.010 | 29.239 |
| 2010 | 31.564 | 27.201 | 29.126 |
| 2011 | 30.761 | 26.362 | 27.912 |
| 2012 | 31.015 | 29.538 | 30.275 |