Google Books Ngram Viewer

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

1999 - 2001 2002 - 2005 2006 2007 2008 billion euro English
1999 - 2001 2002 - 2004 2005 - 2007 2007 2008 billion euros English

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