Year	Percent
1961	0.46866
1962	1.94237
1963	3.94629
1964	0.99343
1965	2.33702
1966	3.57625
1967	0.86758
1968	2.04337
1969	3.25216
1970	1.13413
1971	9.67467
1972	7.49315
1973	11.54438
1974	45.88293
1975	4.95708
1976	7.3078
1977	9.8995
1978	7.33192
1979	18.96471
1980	25.99099
1981	12.86751
1982	3.73085
1983	6.59999
1984	14.60905
1985	10.45134
1986	2.90047
1987	33.28645
1988	21.7679
1989	88.68389
1990	41.74066
1991	21.44961
1992	28.24407
1993	31.64582
1994	62.89069
1995	51.7599
1996	115.52472
1997	38.42008
1998	18.89029
1999	26.19271
2000	29.45283
2001	7.9969
2002	33.02288
2003	34.93376
2004	33.95372
2005	29.60406
2006	17.90432
2007	15.44848
2008	30.13245
2009	7.83167
2010	45.94327
2011	28.14919
2012	14.05943
2013	35.50267
2014	40.44049