Google Books Ngram Viewer

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

1960 - 1968 1969 - 1990 1991 - 1992 1993 - 2003 2004 - 2008 with their having to English
1960 - 1964 1965 - 2003 2004 - 2005 2006 2007 - 2008 with them having to English

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