2006 | 4.7615 |
2007 | 4.9071 |
2008 | 5.2982 |
2009 | 5.5896 |
2010 | 5.6606 |
2011 | 5.5631 |
2012 | 5.5155 |
2013 | 5.5961 |
2014 | 5.4963 |
2015 | 5.5895 |
2016 | 5.7992 |
2017 | 6.0201 |
2018 | 5.9871 |
2019 | 6.1098 |
2020 | 6.2399 |
2021 | 6.3500 |