Year	Percent
1960	44.41622
1961	47.23169
1962	57.47493
1963	29.63898
1964	31.58559
1965	20.24185
1966	22.1621
1967	16.57483
1968	16.36262
1969	16.7891
1970	18.65117
1971	13.91789
1972	23.52006
1973	14.92597
1974	7.19038
1975	27.28421
1976	13.68627
1977	9.41192
1978	19.70217
1979	33.57726
1980	147.9765
1981	180.88
1982	66.33839
1983	82.35543
1984	55.06821
1985	58.39778
1986	57.8044
1987	49.06565
1988	55.74499
1989	87.89979
1990	121.26158
1991	131.61667
1992	159.1729
1993	124.23896
1994	128.35142
1995	116.73349
1996	55.34728
1997	71.37478
1998	60.76559
1999	51.82037
2000	70.93257
2001	73.53077
2002	58.67847
2003	72.39696
2004	76.41557
2005	57.87285
2006	75.37919
2007	66.12833
2008	49.52829
2009	26.70967
2010	23.37819
2011	21.09299
2012	22.97872
2013	18.35579
2014	18.65452
2015	21.19905
2016	23.74743
2017	26.58502
2018	24.28744
2019	22.49032
2020	33.88531
2021	25.77826