Year	% of total
1960	93.53099730458221
1961	93.91534391534393
1962	94.81481481481481
1963	93.44978165938865
1964	97.63313609467454
1965	97.58308157099698
1966	98.05825242718446
1967	97.81357882623705
1968	97.52066115702479
1969	97.89658194566171
1970	98.33836858006042
1971	98.01324503311258
1972	98.50034083162917
1973	98.04054054054055
1974	97.35483870967741
1975	97.49134948096886
1976	98.2421875
1977	98.0732177263969
1978	97.22814498933901
1979	97.43326488706366
1980	97.55381604696673
1981	97.98590130916415
1982	97.60536398467433
1983	97.46716697936209
1984	97.48953974895397
1985	97.65976597659767
1986	98.27437446074202
1987	98.14004376367616
1988	98.5627836611195
1989	98.04878048780488
1990	95.66977653631284
1991	100.1549375
1992	93.90110375275938
1993	90.8128526645768
1994	87.26830472103005
1995	91.79805369127516
1996	99.59434272300469
1997	101.74335260115606
1998	97.63095541401273
1999	96.13486486486487
2000	98.3813153153153
2001	103.0252380952381
2002	106.31381962864721
2003	115.3094064516129
2004	132.89104582843714
2005	107.53131212723656
2006	95.77237138263666
2007	104.05317436661699
2008	101.92288766368023
2009	101.80943257676903
2010	94.39001260239446
2011	92.26028664495114
2012	84.76773175542407
2013	94.55802068965518
2014	91.99792563600782
2015	100.94550561797753
2016	87.87908203125