Year	% of total
1960	50.86887835703001
1961	52.255054432348366
1962	56.82967959527825
1963	58.94568690095847
1964	46.567717996289424
1965	47.3293768545994
1966	56.70731707317073
1967	52.16
1968	73.66702937976062
1969	71.28514056224901
1970	63.24324324324324
1971	62.74752475247525
1972	63.95631067961165
1973	65.67164179104478
1974	66.0500544069641
1975	69.6489241223103
1976	64.76906552094522
1977	67.50788643533123
1978	69.53367875647668
1979	74.12109375000001
1980	69.63350785340313
1981	70.67961165048543
1982	64.31980906921241
1983	73.58834244080145
1984	72.43293246993524
1985	71.29909365558912
1986	68.62106406080348
1987	71.55090390104662
1988	70.71167883211679
1989	75.62604340567614
1990	99.74701257861635
1991	174.28787356321837
1992	185.08439189189187
1993	182.06783216783217
1994	127.485546875
1995	162.05774193548388
1996	177.18944
1997	152.1805
1998	120.48714285714286
1999	95.00863636363637
2000	89.68206521739131
2001	87.2653164556962
2002	84.59102272727273
2003	84.64943925233645
2004	84.62307692307692
2005	83.18429530201342
2006	82.965875
2007	82.76942857142858
2008	86.08625668449199
2009	76.7778125
2010	83.84257281553398
2011	88.18261904761906
2012	90.5432098765432
2013	92.22756164383561
2014	94.00993736951983
2015	91.23089965397924
2016	92.92106796116505