Year	Percent
1987	40.84507
1988	46.2585
1989	45.13889
1990	45.33333
1991	31.25
1992	66.28686
1993	71.75015
1994	109.13051
1995	42.32678
1996	32.37055
1997	42.14259
1998	37.10791
1999	38.09631
2000	39.66721
2001	38.86857
2002	42.3997
2003	46.42211
2004	48.1823
2005	51.56769
2006	57.01668
2007	57.95058
2008	58.40358
2009	48.93413
2010	52.76446
2011	54.77407
2012	57.79832
2013	57.64138
2014	60.47015
2015	62.27023
2016	59.32536
2017	62.16803