Year	Measure
1992	39.441
1993	41.30302
1994	45.69846
1995	47.89398
1996	54.2296
1997	58.5193
1998	50.55482
1999	53.29678
2000	50.69558
2001	55.47416
2002	59.757
2003	62.32838
2004	60.90256
2005	60.97243
2006	57.04944
2007	58.98878
2008	57.17477
2009	60.32015
2010	61.94714
2011	64.13852