Add month column repeated by year using dax

Here's one way to do it in the query editor.  To see how it works, just create a blank query, open the Advanced Editor and replace the text there with the M code below.  You just need to add a custom column with {1..12} and then expand that to new rows.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIwMlTSUXIEYkMDA6VYHbiQExAbIYSMoKqMUYVAqkxAQrEA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Year = _t, Product = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Year", Int64.Type}, {"Product", type text}, {"Value", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Month", each {1..12}),
    #"Expanded Month" = Table.ExpandListColumn(#"Added Custom", "Month"),
    #"Changed Type1" = Table.TransformColumnTypes(#"Expanded Month",{{"Month", Int64.Type}})
in
    #"Changed Type1"

Pat