Measure Repeat Customer by Date

Hi Index_Match 

Try this measure [without Date Table]:

Repeat Customers =
VAR _A =
    ADDCOLUMNS (
        Customer,
        "CY",
            CALCULATE (
                DISTINCTCOUNT ( Customer[Customer] ),
                FILTER (
                    ALL ( customer ),
                    YEAR ( Customer[Year] )
                        = YEAR ( EARLIER ( Customer[Year] ) ) - 1
                        && Customer[Customer] = EARLIER ( Customer[Customer] )
                )
            ) + 0
    )
RETURN
    SUMX ( _A, [CY] )

output:

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