Google Books Ngram Viewer

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

1900 - 1945 1946 - 1971 1972 - 1975 1976 - 2000 2001 - 2008 social class English
1900 - 1929 1930 - 1976 1977 - 1981 1982 - 1995 1996 - 2008 working class English
1900 - 1924 1925 - 1967 1968 - 1973 1974 - 1998 1999 - 2008 middle class English
1900 - 1921 1922 - 1970 1971 - 1976 1977 - 1994 1995 - 2008 upper class English

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