Google Books Ngram Viewer

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

1800 - 1831 1832 - 1889 1890 - 1903 1904 - 1977 1978 - 2017 leaped English
1800 - 1843 1844 - 1928 1929 - 1941 1942 - 1999 2000 - 2017 leapt English

Run your own experiment! Raw data is available for download here.
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