Google Books Ngram Viewer

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

1800 - 1821 1822 - 1908 1909 - 1920 1921 - 1973 1974 - 2000 public service English
1800 - 1942 1943 - 1977 1978 - 1981 1982 - 1996 1997 - 2000 bureaucrats English

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