1993.5    1.4 
1994.5    2.7 
1995.5    5.7 
1996.5   11.4 
1997.5   16.1 
1998.5   21.9 
1999.5   22.1 
2000.5   25.0 
2001.5   29.6 
2002.5   33.3 
2003.5   35.4 
2004.5   37.6 
2005.5   41.4 
2006.5   42.9 
2007.5   43.2 
2008.5   48.6 
2009.5   53.5 
2010.5   54.9 
2011.5   54.6 
2012.5   65.4 
2013.5   67.9 
2014.5   71.3 
