Google Books Ngram Viewer

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

1988 - 1989 1990 - 2000 2001 2002 - 2005 2006 - 2008 light year English
1988 1989 - 2002 2003 2004 - 2008 2009 - 2008 lightyear English

Run your own experiment! Raw data is available for download here.
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