Year	Percent
1979	123.03873
1980	68.39841
1981	47.86056
1982	22.53837
1983	22.25701
1984	51.41368
1985	50.76889
1986	82.36794
1987	48.71585
1988	45.19657
1989	43.18225
1990	42.24341
1991	32.94456
1992	43.78099
1993	30.98002
1994	27.37424
1995	25.21746
1996	24.64288
1997	26.49351
1998	28.44142
1999	21.97325
2000	28.28563
2001	31.50027
2002	30.2913
2003	25.68922
2004	32.79565
2005	27.51621
2006	32.31913
2007	43.06894
2008	36.0457
2009	35.69124
2010	38.08531
2011	29.47634
2012	38.54045
2013	43.33829
2014	46.17014
2015	48.64137
2016	51.94319