Google Books Ngram Viewer

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

1960 - 1992 1993 - 2004 2005 2006 - 2007 2008 climate change English
1960 - 1980 1981 1982 1983 - 2005 2006 - 2008 energy security English

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