Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2005 | 18.915 | 16.487 | 17.785 |
| 2006 | 18.247 | 13.348 | 15.806 |
| 2007 | 16.529 | 14.663 | 15.550 |
| 2008 | 15.498 | 11.633 | 13.146 |
| 2009 | 13.904 | 11.369 | 12.214 |
| 2010 | 13.541 | 12.140 | 12.669 |
| 2011 | 12.204 | 9.467 | 10.567 |
| 2012 | 11.609 | 10.196 | 10.873 |
| 2013 | 11.172 | 9.192 | 10.300 |
| 2014 | 10.027 | 8.636 | 9.481 |
| 2015 | 10.574 | 7.816 | 9.075 |
| 2016 | 8.645 | 7.159 | 8.105 |
| 2017 | 7.288 | 5.426 | 6.424 |
| 2018 | 5.695 | 4.758 | 5.285 |