Average last 10 entries (ignoring zeros)

Hi, I'm hoping there's someone out there that can help me with this one.

I'm trying to get an average of the last 10 cell inputs, ignoring any zeros. The formula is in (I2).

I have a table of data where entries are inputted each week, within a date range of 2017 to 2016 (the first cell B10 is the last week in Dec 2017 and the last cell DA10 corresponding to first week in Jan 2016) . The totals are on the same row B10:DA10 and are represented in weeks. At present data has been inputted to June 2016, but cells after that (to Dec 2017) remain empty. There are 62 week columns in total.

Whilst I'm able to find the average of the inputs, I'm unable to extrapolate the average value of just the last 10 cells (weeks) ignoring the empty date range which is yet to be inputted (i.e. July 2016 to Dec 2017). I've tried this but no joy =AVERAGE(OFFSET(B10,,COUNT(B10:DA10)-10))

Any assistance will be greatly appreciated!

Cheers in advance.