[T-SQL] Summing values by month, and returning 0 for months with no records?

Let's say I have the following really simple table:

If I were to run the following query:

 SELECT Month([Date]), SUM([Amount]) FROM Table GROUP BY Month([Date])

I'd get the following results:

But what I really want are my results to look like this:

How do I tell the query to return a result for all values in MONTH = 1-12