Google Books Ngram Viewer

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

1900 - 1937 1938 - 1948 1949 1950 - 2004 2005 firewoman English
1900 - 1983 1984 - 2001 2002 2003 - 2004 2005 female firefighter English

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