Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2004 | 4.333 | 3.563 | 3.987 |
| 2005 | 4.001 | 3.582 | 3.763 |
| 2006 | 3.967 | 2.806 | 3.363 |
| 2007 | 3.051 | 2.555 | 2.876 |
| 2008 | 2.653 | 1.735 | 2.080 |
| 2009 | 2.490 | 1.981 | 2.271 |
| 2010 | 2.874 | 2.418 | 2.608 |
| 2011 | 2.844 | 2.202 | 2.443 |
| 2012 | 2.540 | 2.155 | 2.388 |
| 2013 | 2.279 | 1.847 | 2.035 |
| 2014 | 2.039 | 1.801 | 1.912 |
| 2015 | 2.167 | 1.553 | 1.938 |
| 2016 | 1.891 | 1.478 | 1.666 |
| 2017 | 2.005 | 1.505 | 1.759 |
| 2018 | 1.782 | 1.431 | 1.647 |
| 2019 | 1.691 | 1.560 | 1.630 |