Year | |
---|---|
1997 | 15.4 |
1998 | 11.2 |
1999 | 11.3 |
2000 | 18.5 |
2001 | 23.6 |
2002 | 30.4 |
2003 | 20.6 |
2004 | 25.5 |
2005 | 38.3 |
2006 | 23.6 |
2007 | 24.0 |
2008 | 19.3 |
2009 | 7.5 |
2010 | 11.2 |
2011 | 19.4 |
2012 | 20.2 |
2013 | 19.1 |
2014 | 20.4 |
2015 | 15.9 |
2016 | 16.5 |
2017 | 13.6 |
2018 | 13.3 |
2019 | 15.9 |
2020 | 15.9 |
2021 | 13.4 |
2022 | 14.8 |
2023 | 13.6 |
2024 | 15.7 |