fix a value for a line chart in Power BI

I have a line and column chart in PowerBi that shows in the columns the sales in each month. i want to show in the line y-axis the total average of the year; I mean, a only value to get a straight line across my visual.

I want to get Something like this

I tried to modify my average measure to remove the month filter, because is what i think is affecting my line, but its still being modified by the filter (and i need to conserve that filter for the columns)

i tried these measures but none of them worked:

1. AVERAGEX( VALUES('Calendar'[Month]), CALCULATE([Sales]) )

2. CALCULATE(AVERAGEX(VALUES('Calendar'[Month]),CALCULATE([Sales])),REMOVEFILTERS('Calendar'[Year]) )

This is the data that I used for testing

Then I created a calendar table and created relationship with fact table

At last, you can create a measure

MEASURE =
DIVIDE (
    CALCULATE ( SUM ( 'Table'[value] ), ALL ( 'Table' ) ),
    CALCULATE ( DISTINCTCOUNT ( 'date'[month] ), ALL ( 'date' ) )
)