Google Books Ngram Viewer

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

1800 - 1905 1906 - 1948 1949 - 1952 1953 - 1987 1988 - 2000 diptongación Spanish
1800 - 1822 1823 - 1827 1828 1829 - 1969 1970 - 2000 diptongo Spanish

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