Year	Number
1998	14.32535
1999	14.14692
2000	13.63545
2001	13.67968
2002	13.53766
2003	13.58042
2004	12.12267
2005	11.95668
2006	11.70767
2007	11.50028
2008	11.37433
2009	11.64981
2010	12.12527
2011	12.2561
2012	12.45239