Google Books Ngram Viewer

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

1800 - 1881 1882 - 1912 1913 - 1919 1920 - 1974 1975 - 2000 economical development English
1800 - 1940 1941 - 1973 1974 - 1978 1979 - 1996 1997 - 2000 economic development English

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