01 January 1970 0 4K Report

I have few data sequences/series* representing data from one period to 2017. I want to see with the passage of time, whether the sequences are coming closer or going away. Is there any method/technique in grey system theory or fuzzy mathematics, or in general mathematics to test this? 

* e.g., (11, 12, 17, 35, .... etc)

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