Annual % of total
1960 56.81818181818181
1961 34.6613545816733
1962 22.49240121580547
1963 121.84873949579833
1964 54.97584541062802
1965 43.33098094565984
1966 65.18987341772153
1967 62.92490118577074
1968 75.77132486388385
1969 78.77934272300469
1970 39.81255093724532
1971 43.07692307692308
1972 43.861209964412815
1973 37.0269215762778
1974 31.667274717256475
1975 30.182926829268293
1976 23.64724844577481
1977 28.043527544774427
1978 36.578947368421055
1979 37.82065336549002
1980 42.563325395107164
1981 38.24091778202677
1982 39.40298507462687
1983 47.413405308142146
1984 44.29109159347553
1985 45.459363957597176
1986 42.69141531322506
1987 44.474675596483884
1988 45.204529697249825
1989 58.973194002726025
1990 76.25072997873848
1991 83.49476923076922
1992 93.19651299245598
1993 88.42557337610265
1994 89.92880952380953
1995 87.5788829787234
1996 99.31228571428571
1997 100.36981118373276
1998 115.15940425531915
1999 128.6675721323012
2000 136.61873259052925
2001 146.2284575502268
2002 154.09640449438203
2003 179.352682767624
2004 186.08245460237944
2005 171.1950228774784
2006 171.4017191719172
2007 180.97400996828276
2008 183.2112298959319
2009 193.75708766716195
2010 185.86275419982317
2011 178.8907761966365
2012 183.5986663652803
2013 180.83327320721511
2014 188.40216240875912
2015 191.9569285042333
2016 207.36754251234234