All ords accumulated Monthly Closing Stock: Sep 55459.

Can you please advise how I would calculate and then present in an analysis the historical monthly rates of return for the following:

All ords accumulated

Monthly Closing Stock:

Sep55459.750

Oct 57712.860

Nov 58813.500

dec60007.770

Jan59809.190

Feb59916.010

My main issue I am having here is the interpretation. Thanks.