SQL Server - Show Top entries in List

I have to sort, by hour, the number of times someone calls from a specific country. The list of countries increases on a monthly basis, so for example we can add Brazil. I am using SQL Server.

The Data Looks like This

2012-04-02 08:00:59    United States
 2012-04-02 08:12:02    United States
 2012-04-02 08:13:42    Canada
 2012-04-02 08:13:56    United States
 2012-04-02 08:14:07    Mexico
 2012-04-02 08:18:09    Canada
 2012-04-02 08:19:50    United States
 2012-04-02 08:34:34    Mexico
 etc.
 

How I would like to list the data is by top 2 countries by hour.

I would like it to display like:

Date                   Country          Calls
 2012-04-02 08:00:00    United States    24
 2012-04-02 08:00:00    Canada           19
 --hidden--
 2012-04-02 08:00:00    Mexico           12
 

The Code that i tried (does not work):

Declare @StartDate datetime, @EndDate datetime
     set @StartDate = '20120401 00:00:00'
   set @EndDate = '20120430 23:59:59'
 SELECT  DATEADD(HOUR, DATEPART(HOUR, [date]), DATEDIFF(DAY, 0, [date])) as [date],
 (SELECT COUNT([country]) FROM [mytable] WHERE [date] between @StartDate and @EndDate and [country] = 'United States' ) as [United_States]
 ,(SELECT COUNT([country]) FROM [mytable] WHERE [date] between @StartDate and @EndDate and [country] = 'Canada' ) as [Canada]
 ,(SELECT COUNT([country]) FROM [mytable] WHERE [date] between @StartDate and @EndDate and [country] = 'Mexico' ) as [Canada]
 FROM [mytable] 
 WHERE [date] between @StartDate and @EndDate
 GROUP BY DATEADD(HOUR, DATEPART(HOUR, [date]), DATEDIFF(DAY, 0, [date]))
 ORDER BY [date]
 

Thank You.

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