Google Books Ngram Viewer

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

1960 - 1972 1973 - 1998 1999 - 2001 2002 - 2004 2005 - 2008 plummeted English
1960 - 1963 1964 - 1988 1989 - 1993 1994 - 2004 2005 - 2008 fell heavily English
1960 - 1964 1965 - 1985 1986 - 1989 1990 - 2000 2001 - 2008 dropped sharply English
1960 - 1965 1966 - 1992 1993 - 1996 1997 - 2001 2002 - 2008 fell sharply English
1960 - 1962 1963 - 1966 1967 - 1970 1971 - 2005 2006 - 2008 fell suddenly English

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