Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2005 | 6.729 | 6.058 | 6.424 |
| 2006 | 6.506 | 5.856 | 6.159 |
| 2007 | 6.250 | 5.287 | 5.902 |
| 2008 | 5.646 | 4.465 | 5.118 |
| 2009 | 6.409 | 4.890 | 5.385 |
| 2010 | 6.592 | 5.362 | 5.934 |
| 2011 | 6.326 | 5.442 | 5.780 |
| 2012 | 6.659 | 6.014 | 6.338 |
| 2013 | 6.743 | 5.777 | 6.219 |
| 2014 | 6.739 | 5.989 | 6.343 |
| 2015 | 7.105 | 5.447 | 6.334 |
| 2016 | 6.178 | 5.626 | 5.901 |
| 2017 | 5.791 | 5.085 | 5.436 |
| 2018 | 5.628 | 5.187 | 5.372 |