Fixed values but variable year

I have this two measures, the first one calculates the average sales of the full year and show it in my graph as a fixed value; the second one calculates and show the same but for the prior year.

Fixed= DIVIDE(
    CALCULATE(DIVIDE([Sales], 50), ALL('DataMain')),
    CALCULATE(DISTINCTCOUNT('Calendar'[Month]), ALLEXCEPT('Calendar', 'Calendar'[Year]))
)

FixedPriorYear = 
DIVIDE (
    CALCULATE ( 
        DIVIDE([Sales], 20), 
        ALL ( 'DataMain' ),
        PARALLELPERIOD('Calendar'[Date], -1, YEAR)
    ),
    CALCULATE ( 
        DISTINCTCOUNT ( 'Calendar'[Month]), 
        ALL ('Calendar'),
        PARALLELPERIOD('Calendar'[Date], -1, YEAR)
    )
)

The problem that i want to solve is that, the averge is correctly calculated and displayed, but when i change the the year using a slicer, the average is not recalculating.

Data example year 2023: | Month | Sales | | -------- | -------------- | | January | 100 | | February | 200 | | March | 300 | | April | 400 | | May | 500 | | June | 600 | | July | 700 | | August | 800 | | September| 900 | | October | 1000 | | November | 1100 | | December | 1200 |

the sum of these values is 7800, the average is 650. With those measures i have the same result (650) to display it in each month. But when i change the year in my slicer, the result dont change.

Here´s a image to show what i have at the moment. I only need that when i change the year in my slicer, the average recalculate itself.

This is the sample data I used for test.

you can create a measure

MEASURE =
DIVIDE (
    CALCULATE (
        SUM ( 'Table'[Sales] ),
        FILTER ( ALL ( 'Table' ), 'Table'[year] = MAX ( 'Table'[year] ) )
    ),
    CALCULATE (
        COUNT ( 'Table'[month] ),
        FILTER ( ALL ( 'Table' ), 'Table'[year] = MAX ( 'Table'[year] ) )
    )
)