Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2004 | 2.381 | 2.139 | 2.243 |
| 2005 | 2.459 | 2.160 | 2.339 |
| 2006 | 2.476 | 2.242 | 2.365 |
| 2007 | 2.329 | 1.912 | 2.183 |
| 2008 | 1.931 | 1.282 | 1.569 |
| 2009 | 1.605 | 1.386 | 1.491 |
| 2010 | 1.803 | 1.546 | 1.652 |
| 2011 | 1.740 | 1.509 | 1.596 |
| 2012 | 1.845 | 1.625 | 1.737 |
| 2013 | 1.920 | 1.695 | 1.788 |
| 2014 | 2.087 | 1.836 | 1.970 |
| 2015 | 2.372 | 1.948 | 2.174 |
| 2016 | 2.209 | 1.974 | 2.106 |
| 2017 | 2.271 | 1.914 | 2.069 |
| 2018 | 2.075 | 1.859 | 1.962 |