Year	Percent
1971	130.07835
1972	269.02448
1973	277.52173
1974	152.23471
1975	159.17293
1976	219.81687
1977	203.0954
1978	111.62221
1979	71.02323
1980	63.15116
1981	38.15279
1982	16.42574
1983	10.88927
1984	7.19557
1985	7.71349
1986	13.28905
1987	8.97488
1988	9.54794
1989	11.98484
1990	12.3127
1991	15.30652
1992	17.52528
1993	15.92566
1994	18.74247
1995	18.5987
1996	12.90837
1997	11.04245
1998	6.28264
1999	4.59219
2000	3.34382
2001	1.64371
2002	4.79672
2003	4.99623
2004	4.87311
2005	7.8093
2006	9.55885
2007	12.56491
2008	19.17142
2009	53.20713
2010	53.48268
2011	48.88189
2012	46.26849
2013	48.17202
2014	45.95095
2015	21.7474
2016	15.03815