Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2005 | 2.596 | 2.250 | 2.468 |
| 2006 | 2.640 | 2.284 | 2.465 |
| 2007 | 2.415 | 1.898 | 2.222 |
| 2008 | 2.025 | 1.580 | 1.771 |
| 2009 | 1.961 | 1.647 | 1.834 |
| 2010 | 2.352 | 1.922 | 2.103 |
| 2011 | 2.215 | 1.900 | 2.018 |
| 2012 | 2.235 | 1.958 | 2.093 |
| 2013 | 2.083 | 1.620 | 1.887 |
| 2014 | 1.837 | 1.635 | 1.749 |
| 2015 | 2.009 | 1.649 | 1.839 |
| 2016 | 1.941 | 1.767 | 1.837 |
| 2017 | 1.930 | 1.569 | 1.749 |
| 2018 | 1.606 | 1.458 | 1.523 |