Annual % of total
1960 91.02564102564104
1961 92.5925925925926
1962 90.36144578313252
1963 89.70588235294117
1964 90.24390243902438
1965 92.7710843373494
1966 93.97590361445783
1967 92.95774647887323
1968 91.66666666666666
1969 91.86046511627906
1970 92.38095238095238
1971 90.9090909090909
1972 89.71962616822428
1973 86.95652173913044
1974 85.27131782945736
1975 84.0909090909091
1976 82.06521739130434
1977 82.90155440414509
1978 83.49514563106796
1979 84.46601941747572
1980 83.90243902439025
1981 84.688995215311
1982 75.1111111111111
1983 71.31147540983605
1984 70.68273092369479
1985 68.8715953307393
1986 79.56521739130436
1987 81.12449799196789
1988 79.92831541218638
1989 86.21908127208481
1990 85.9228431372549
1991 80.3073
1992 81.4888888888889
1993 91.67500000000001
1994 96.5
1995 97.37922222222223
1996 96.17226415094339
1997 106.25637795275588
1998 94.05435114503817
1999 95.12942028985508
2000 91.30081632653062
2001 91.675
2002 91.9755737704918
2003 87.92696132596686
2004 110.00999999999999
2005 112.58333333333333
2006 114.48715116279071
2007 110.1897549019608
2008 110.7325615763547
2009 106.50884422110552
2010 80.3460569105691
2011 73.86385714285714
2012 86.5412
2013 82.60824175824175
2014 88.55924836601308
2015 85.3792469879518
2016 84.6645588235294