Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2004 | 3.546 | 2.873 | 3.300 |
| 2005 | 3.267 | 2.817 | 3.080 |
| 2006 | 3.171 | 2.670 | 2.908 |
| 2007 | 2.795 | 2.265 | 2.601 |
| 2008 | 2.637 | 1.854 | 2.194 |
| 2009 | 3.009 | 2.179 | 2.449 |
| 2010 | 2.781 | 2.209 | 2.459 |
| 2011 | 2.586 | 2.093 | 2.272 |
| 2012 | 2.724 | 2.376 | 2.524 |
| 2013 | 2.618 | 2.405 | 2.523 |
| 2014 | 2.938 | 2.526 | 2.676 |
| 2015 | 3.350 | 2.944 | 3.170 |
| 2016 | 3.356 | 3.013 | 3.148 |
| 2017 | 3.354 | 2.725 | 3.004 |
| 2018 | 2.736 | 2.578 | 2.638 |