Google Books Ngram Viewer

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

1800 - 1898 1899 1900 - 1998 1999 2000 π English
1800 - 1815 1816 - 1931 1932 - 1947 1948 - 1982 1983 - 2000 pi English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer