2000.5  2000  -13.5088 
2001.5  2001  -12.9685 
2002.5  2002  -13.2723 
2003.5  2003  -15.8646 
2004.5  2004  -11.8380 
2005.5  2005  -11.7721 
2006.5  2006  -8.6113 
2007.5  2007  -6.0353 
2008.5  2008  -6.0709 
2009.5  2009  -2.8289 
2010.5  2010  -6.0064 
2011.5  2011  -7.5082 
2012.5  2012  -8.4462 
2013.5  2013  -7.6288 
2014.5  2014  -7.3318