Any Excel masters here?

I'm utterly clueless about manipulating spreadsheets etc, so thought I'd ask here for help: 

This is my Drama spreadsheet

http://tiny.cc/howquery

And this is a Pivot Table of averages by year

The trouble is, the year with the highest average only supplied 6 of the 355 completed Dramas I've watched. So I'd like to run a query something like "Average of score by Year when count of Year is Greater than X"  - what sort of query syntax do I need to achieve that result?