Zobrazení grafu: týden | měsíc | půl roku | rok | 5 let | 15 let
| Rok | Maximální | Minimální | Průměr |
|---|---|---|---|
| 2004 | 17.062 | 15.541 | 16.334 |
| 2005 | 15.622 | 14.758 | 15.226 |
| 2006 | 14.848 | 14.019 | 14.488 |
| 2007 | 14.711 | 13.293 | 14.190 |
| 2008 | 13.770 | 11.743 | 12.765 |
| 2009 | 15.067 | 12.824 | 13.494 |
| 2010 | 13.532 | 12.476 | 12.938 |
| 2011 | 13.307 | 12.276 | 12.572 |
| 2012 | 13.277 | 12.493 | 12.855 |
| 2013 | 14.172 | 12.854 | 13.283 |
| 2014 | 14.317 | 13.956 | 14.076 |
| 2015 | 14.526 | 13.811 | 13.951 |
| 2016 | 13.882 | 13.810 | 13.822 |
| 2017 | 13.837 | 12.992 | 13.463 |
| 2018 | 13.333 | 12.880 | 13.109 |