Annual % of total
1960 87.30158730158729
1961 91.71779141104295
1962 98.25174825174825
1963 98.49624060150376
1964 98.89502762430939
1965 98.19494584837545
1966 100
1967 13.215771745591443
1968 9.843046599342987
1969 18.13305827746261
1970 8.812521265736645
1971 12.180247331865154
1972 20.99181511795859
1973 28.783308195072905
1974 50.64731267163592
1975 47.245091830272315
1976 51.12566516577978
1977 53.857377348167056
1978 46.85773480662983
1979 50.246513593463874
1980 52.814501839989106
1981 67.30304187348861
1982 70.8546906663488
1983 67.31372076199662
1984 61.478349987189354
1985 64.6591970121382
1986 51.73341946597761
1987 58.450624929625036
1988 59.67156961515212
1989 56.062094714089206
1990 52.42926018287615
1991 75.94828031212485
1992 75.73625742574256
1993 82.85232166018159
1994 82.5100529100529
1995 85.10687383302214
1996 73.91704060913705
1997 76.90906266050334
1998 77.99038095238096
1999 85.72070152390961
2000 83.91700025081515
2001 81.82818006275646
2002 76.02296559633027
2003 77.39788166214994
2004 74.64590019784568
2005 69.77973336047222
2006 66.49176422928903
2007 64.0398098941456
2008 64.29896055954926
2009 69.15576286935514
2010 67.37463742792241
2011 66.4204047306176
2012 63.89554684512429
2013 64.98438807055828
2014 60.7174120603015
2015 61.68651374442794
2016 58.35101211410707