Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 1999 | 38.600 | 34.860 | 36.873 |
| 2000 | 37.040 | 34.220 | 35.612 |
| 2001 | 35.545 | 31.455 | 34.066 |
| 2002 | 32.375 | 28.970 | 30.811 |
| 2003 | 32.885 | 31.175 | 31.844 |
| 2004 | 33.330 | 30.400 | 31.902 |
| 2005 | 30.555 | 28.865 | 29.781 |
| 2006 | 29.045 | 27.420 | 28.336 |
| 2007 | 28.775 | 26.000 | 27.754 |
| 2008 | 26.930 | 22.970 | 24.969 |
| 2009 | 29.470 | 25.085 | 26.395 |
| 2010 | 26.465 | 24.405 | 25.307 |
| 2011 | 26.025 | 24.010 | 24.590 |
| 2012 | 25.910 | 25.065 | 25.476 |