Google Books Ngram Viewer

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

1900 - 1968 1969 - 1997 1998 - 2000 2001 - 2004 2005 - 2008 us dollar English
1900 - 1929 1930 - 1946 1947 - 1951 1952 - 1990 1991 - 2008 united states dollar English

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