Year	Percent
1960	0.1329
1961	5.92934
1962	8.34007
1963	6.2456
1964	23.60955
1965	28.19127
1966	40.07275
1967	38.16628
1968	49.19801
1969	85.70947
1970	49.26986
1971	75.79332
1972	52.59039
1973	50.11885
1974	87.2631
1975	91.44542
1976	83.10589
1977	37.38155
1978	38.04751
1979	31.66352
1980	23.4577
1981	43.44071
1982	61.90797
1983	76.73044
1984	342.93491
1985	162.08319
1986	137.4857
1987	136.29832
1988	85.48981
1989	99.97941
1990	97.78688
1991	93.02603
1992	123.91249
1993	169.7858
1994	148.22498
1995	98.31008
1996	71.4357
1997	106.74472
1998	75.61137
1999	65.889
2000	71.0111
2001	76.68092
2002	72.69414
2003	101.73724
2004	116.75324
2005	61.71913
2006	57.52082
2007	53.08383
2008	31.89282
2009	22.48248
2010	28.93004
2011	23.24472
2012	32.24763
2013	26.24363
2014	27.15751
2015	27.75012
2016	33.28164
2017	42.08832
2018	35.24682
2019	36.41104
2020	49.25411
2021	43.17993