Finding Averages of a Bar Chart

[vancet]

I have a bar chart that is showing total people served on an annual basis (Year is the Dimension, Client Count is my Measure) and then I have a second dimension stacked with the first to show the number of people served by County.  I am wanting to create a KPI for each county that will show the average number of people served in each County based on the year/years selected.  Anyone have thoughts of how to build the KPI?

[Chanty4u]

Try this 

=Avg(Aggr(Sum([Client Count]), Year, County))

For specific country 

=Avg(

    Aggr(

        Sum({<County={'india'}>} [Client Count]),

        Year

)

)

[vancet]

Thank you.  I'm trying the second one to make each KPI correlate to a specific county.  Here's what's I'm entering in my expression:

avg(aggr(sum({<[Client.County]={'Barber'}>}[Client Count]), Year))

When I exit the editor the KPI is drawing no results.  Any thoughts?