Year	% of total
1960	0
1961	0
1962	0
1963	2.7479091995221023
1964	2.396259497369959
1965	2.4475524475524475
1966	2.5116822429906542
1967	3.234649122807018
1968	13.930605903676852
1969	22.750511247443765
1970	25.436046511627907
1971	21.11378205128205
1972	19.65317919075144
1973	24.352941176470587
1974	23.811188811188806
1975	38.72155287817939
1976	27.295197740112993
1977	31.10454377539712
1978	26.915041782729805
1979	58.350357507660874
1980	65.98544232922733
1981	74.28001140575991
1982	71.71267438409023
1983	73.60885128538888
1984	63.60392506690455
1985	69.46497191841561
1986	81.10865968008825
1987	78.95408163265306
1988	79.86474023977867
1989	80.49654466342463
1990	71.02984848484849
1991	98.4894455852156
1992	150.35199591280653
1993	167.41784377017433
1994	159.58784000000003
1995	152.36794359576967
1996	146.94616973757678
1997	144.56841131105398
1998	96.2829793368573
1999	97.6109063180828
2000	111.86628163828809
2001	104.84279267773519
2002	90.62538768115942
2003	92.74681425112418
2004	102.9885741146976
2005	77.13314195736434
2006	80.29409293019121
2007	81.29893437806072
2008	75.3185732391816
2009	78.30459331817387
2010	85.81851774530271
2011	101.4683487912422
2012	111.52103015418203
2013	92.68268766756033
2014	121.88214054726367
2015	119.47791141519626
2016	112.74047021575986