Google Books Ngram Viewer

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

1800 - 1819 1820 - 1836 1837 - 1918 1919 - 1998 1999 - 2005 nosotras Spanish
1800 - 1810 1811 - 1823 1824 - 1835 1836 - 1962 1963 - 2005 vosotras Spanish

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