Google Books Ngram Viewer

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

1960 - 1963 1964 1965 - 1979 1980 - 1997 1998 - 2008 per cent in that order English
1960 - 1963 1964 - 1983 1984 - 1987 1988 - 1998 1999 - 2008 per cent respectively English
1960 - 1967 1968 - 1989 1990 - 1991 1992 - 2003 2004 - 2008 % in that order English

Run your own experiment! Raw data is available for download here.
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