How many SciFi movies come out each year?

I noticed an interesting trend on imdb.com.  The number of SciFi movies is steadily increasing with each decade.  It may go up and down year after year but the trend is definitely more SciFi movies per year on the average.  The snap-shot below was taken Dec 28, 2013.

• 1908 (3)
• 1910 (3)
• 1914 (4)
• 1915 (5)
• 1916 (7)
• 1918 (5)
• 1920 (8)
• 1921 (5)
• 1922 (4)
• 1924 (6)
• 1925 (7)
• 1929 (4)
• 1930 (4)
• 1931 (4)
• 1932 (9)
• 1933 (15)
• 1934 (8)
• 1935 (19)
• 1936 (14)
• 1937 (10)
• 1938 (10)
• 1939 (10)
• 1940 (16)
• 1941 (10)
• 1942 (15)
• 1943 (8)
• 1944 (13)
• 1945 (5)
• 1946 (4)
• 1947 (5)
• 1948 (7)
• 1949 (15)
• 1950 (16)
• 1951 (79)
• 1952 (142)
• 1953 (241)
• 1954 (225)
• 1955 (177)
• 1956 (144)
• 1957 (88)
• 1958 (82)
• 1959 (178)
• 1960 (242)
• 1961 (243)
• 1962 (221)
• 1963 (280)
• 1964 (407)
• 1965 (567)
• 1966 (766)
• 1967 (849)
• 1968 (690)
• 1969 (523)
• 1970 (486)
• 1971 (253)
• 1972 (287)
• 1973 (339)
• 1974 (320)
• 1975 (346)
• 1976 (302)
• 1977 (421)
• 1978 (660)
• 1979 (794)
• 1980 (628)
• 1981 (627)
• 1982 (713)
• 1983 (839)
• 1984 (668)
• 1985 (1,150)
• 1986 (959)
• 1987 (985)
• 1988 (761)
• 1989 (812)
• 1990 (749)
• 1991 (875)
• 1992 (810)
• 1993 (892)
• 1994 (1,308)
• 1995 (1,343)
• 1996 (1,525)
• 1997 (1,608)
• 1998 (1,528)
• 1999 (1,796)
• 2000 (1,869)
• 2001 (1,827)
• 2002 (2,228)
• 2003 (2,242)
• 2004 (2,191)
• 2005 (2,192)
• 2006 (2,315)
• 2007 (2,126)
• 2008 (2,342)
• 2009 (2,930)
• 2010 (3,302)
• 2011 (3,656)
• 2012 (4,267)
• 2013 (3,942)
• 2014 (893)
• 2015 (139)
• 2016 (25)
• 2017 (22)