Year	Number
1993	10.43006
1994	10.35807
1995	10.56492
1996	10.73096
1997	10.56492
1998	10.31872
1999	10.43009
2000	11.43199
2001	11.6634
2002	11.53539
2003	11.27496
2004	11.27846
2005	11.48669
2006	10.77994
2007	11.32316
2008	7.52889
2009	7.63616
2010	7.44121
2011	7.43556
2012	7.99394