Year	Percent
1980	111.06647
1981	43.51
1982	39.436
1983	44.92857
1984	70.30957
1985	59.1437
1986	49.86667
1987	59.50833
1988	62.83145
1989	68.09385
1990	74.79866
1991	67.09433
1992	87.55088
1993	66.58408
1994	57.70292
1995	75.83155
1996	65.215
1997	67.16271
1998	58.97772
1999	71.40864
2000	64.80193
2001	71.77668
2002	73.67952
2003	60.35119
2004	60.42765
2005	69.87927
2006	62.99429
2007	61.39268
2008	59.42717
2009	56.16893
2010	50.22772
2011	56.6466
2012	60.82246
2013	55.45231
2014	65.63731
2015	81.41158
2016	70.45989
2017	62.962