Google Books Ngram Viewer

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

1800 - 1990 1991 - 1997 1998 1999 2000 sustainably English
1800 - 1982 1983 - 1995 1996 1997 - 1999 2000 unsustainably English

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