Year	Percent
1961	0.00455
1963	8.13501
1964	3.19759
1965	2.07771
1966	0.20876
1967	0.1561
1968	0.67191
1969	0.22014
1970	0.17076
1971	0.14791
1972	0.13076
1973	0.11228
1974	0.16035
1975	0.39011
1976	0.90122
1977	0.89194
1978	1.98104
1979	2.11434
1980	14.20087
1981	10.47409
1982	13.11387
1983	18.67805
1984	27.42772
1985	23.42323
1986	19.85822
1987	28.91907
1988	18.48513
1989	20.9382
1990	21.89918
1991	23.54471
1992	57.833
1993	33.40087
1994	34.33323
1995	35.15513
1996	23.44129
1997	21.76443
1998	19.67273
1999	24.77771
2000	19.34811
2001	23.02535
2002	62.79608
2003	40.79376
2004	71.54833
2005	424.87115
2006	325.30362
2007	126.90149
2008	270.60973
2009	59.78104
2010	31.53608
2011	29.45196
2012	59.37084
2013	47.0679
2014	40.47271
2015	39.34708
2016	32.28662
2017	42.55229
2018	16.44199
2019	28.01766
2020	34.82003
2021	22.14752