On my reading list in Google Docs I also note, since 2013, in which year the books are published. I just noticed that so far this year I've read mostly books published in the last couple of years, the oldest was published in 2008, the average year is 2014. I've looked back and it seems like each year I'm reading newer books.
Average year of publication
2013: 2002
2014: 2007
2015: 2009
2016: 2008
2017: 2014 (so far)
It'll be interesting to see how the year develops.
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