Create An Incremental Counter In The Stored Procedure

Hello, I have a following SP
I want to add an extra field "ranking" that just increments the row number.
Another feature would be: if several users have an equal totalvalue, they
should have an equal ranking number. the rankings following users would have
to be adjusted as well. thanks

SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO


CREATE PROCEDURE [dbo].[Rankings]
@iErrorCode int OUTPUT
AS

SELECT top 30
###COUNTER##,
[user],
[totalvalue], [cash], [stocksvalue]

FROM [dbo].[users]
ORDER BY totalvalue DESC

SELECT @iErrorCode=@@ERROR

GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO