Google Books Ngram Viewer

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

1940 - 1978 1979 - 1994 1995 1996 - 1998 1999 - 2000 gdp English
1940 - 1992 1993 - 1997 1998 1999 2000 human development index English
1940 - 1966 1967 - 1993 1994 - 1996 1997 - 1999 2000 gross domestic product English
1940 - 1957 1958 - 1974 1975 - 1977 1978 - 1995 1996 - 2000 median income English

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