File:Avg num ns 30 2009-2017.png
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![File:Avg num ns 30 2009-2017.png](https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Avg_num_ns_30_2009-2017.png/800px-Avg_num_ns_30_2009-2017.png?20170817235158)
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