Sum monthly Average - DAX HELP

Hi,

I have a table like :

Date  CustomerID  TotalPrice

and I have create 3 measures :

1. Sum of total price

2. Count of distinct customer

3. avarege - measure 1 / measure 2

When I use it on a chart with yearmonth on the X axis everything works fine.

But I want to sum that avg for a year view.

I mean if I have on

jan2018 -avg= 100

feb18 - avg =200

march18 - avg =250

I will want to see on 2018 sumavg 550

if I just put the year on the X axis it will make avg for the all year and not only by month

its make a problem because i have diffrent number of customers each month and it will not reflect the real snapshot for my bussiness.

Thanks for your help.