Google Books Ngram Viewer

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

1800 - 1948 1949 - 1989 1990 - 1993 1994 - 1997 1998 - 2000 buy time English
1800 - 1955 1956 - 1992 1993 - 1995 1996 - 1997 1998 - 2000 invest time English

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