MOnth over Month Variance in %

Hi All,
I have data based on truck load for various states.
The data points range from Oct'14 To Mar'15. Now I need to know what was the
difference in load in Nov as compared to Oct in both real numbers as well as
in %. Similarly for all the month in comparison to the previous month. 
I am able to get the desired result in excel and not sure on how to achieve
the same in R.

Kindly suggest. 



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