Annual % 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