Google Books Ngram Viewer

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

1960 - 1976 1977 - 2005 2006 2007 2008 mass incarceration English
1960 - 1974 1975 - 2000 2001 - 2002 2003 - 2005 2006 - 2008 over incarceration English
1960 - 1968 1969 - 2004 2005 - 2006 2007 2008 mass imprisonment English
1960 - 1971 1972 - 1996 1997 - 2000 2001 - 2004 2005 - 2008 over imprisonment English

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