In the past five years, the number of books read by a reading club in each year has been: 120 books in 2018, 150 books in 2019, 180 books in 2020, 160 books in 2021, and 190 books in 2022. What is the average number of books read per year by the reading club over these five years? Let's think step by step and output the final answer within \boxed{}.
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