Weird book statistics

 I have been updating my book collection with Librarything, and have discovered that it can generate a lot of statistics about my collection.  If I stacked my books in a pile, it would be 74 feet high, at around 4% of my books aren't written by a person(!). Of the 200 identified authors, 48% are still alive, while 48% have died. 98% of my books are in English, although a number were originally written in other languages (mainly Russian). But probably the most surprising, and somewhat disappointing statistic is that only 1% of the authors in my collection were female.