Variance Column

Give this measure a try 

Yearly Variance = 
VAR CurrentYear = SELECTEDVALUE('Date'[Year])
VAR PreviousYear = CurrentYear - 1
VAR Metric = SELECTEDVALUE('Metrics'[Metric])

RETURN
SWITCH(
    TRUE(),
    Metric = "Orders", [Orders],
    Metric = "Sales", [Sales],
    Metric = "Income", [Income]
) - 
CALCULATE(
    SWITCH(
        TRUE(),
        Metric = "Orders", [Orders],
        Metric = "Sales", [Sales],
        Metric = "Income", [Income]
    ),
    'Date'[Year] = PreviousYear
)