Calculated column with compounded accumulated performance (for stocks)

Hello everyone,

I've been reading a lot regarding accumulated sums in a column, but none of the questions/answers used a case like this, where it's not simply adding numbers, but more related to compounding, so here's the problem:

I've got performances by month of a stock, and I want to calculate the accumulated performance during a year, month by month.

An example of the calculation would be:

Accumulated performance in January = 5%

February's performance = 2.5%

Accumulated performance on the first of March = (1 + 0.05) * (1+ 0.025)-1 = 7.625% (NOT 7.5% as it would usually be)

And here's how I calculate it on excel (last column): 

Well, that's all I've got, if you need anything else please let me know, I've been trying this for days.

Thank you so much in advance.