Google Books Ngram Viewer

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

1800 - 1860 1861 - 1967 1968 - 1981 1982 - 1995 1996 - 2008 further apart English
1800 - 1872 1873 - 1932 1933 - 1943 1944 - 1989 1990 - 2008 farther apart English

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