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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=harken,hearken%20back&corpus=en-2019&smoothing=3&year_end=2019&year_start=1800" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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harken
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1800 - 1820
1821 - 1907
1908 - 1924
1925 - 1997
1998 - 2019
English (2019)
hearken back
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1800 - 1940
1941 - 2008
2009 - 2011
2012 - 2015
2016 - 2019
English (2019)