How I accumulate clients different months

Ok. With this model:

And these measures:

Number of attentions = COUNT(FactTable[CUSTOMER])

Distinct Customers = DISTINCTCOUNT(FactTable[CUSTOMER])

and..

New customers =
CALCULATE (
    DISTINCTCOUNT ( FactTable[CUSTOMER] ),
    FILTER (
        ALL ( 'Date Table' ),
        'Date Table'[Date] <= MAX ( 'Date Table'[Date] )
    )
)

You get the following:

This should work:

New customers =
VAR _Year = SELECTEDVALUE ( Date Table [Year] )
CALCULATE (
    DISTINCTCOUNT ( FactTable[CUSTOMER] ),
    FILTER (
        ALL ( 'Date Table' ),
        'Date Table'[Date] <= MAX ( 'Date Table'[Date] )
        && Date Table [Year] = _Year
    )
)