Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1950 - 1954 1955 - 1969 1970 - 1974 1975 - 2001 2002 - 2008 conceived English
1950 - 1967 1968 - 1996 1997 - 1999 2000 - 2003 2004 - 2008 conceptualized English
1950 - 1964 1965 - 1981 1982 - 1983 1984 - 2001 2002 - 2008 concepted English

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