SQL Server WHERE clause default to all unless variable entered -

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i have table of 10 columns of data , i'd able make stored procedure pulls relevant data based on user-defined parameters. simplified version of fact.spend table looks this:

location  |  year  |  spendyear ----------+--------+----------- new york  |  2015  |  25.00 new york  |  2016  |  23.20 dallas    |  2015  |  29.30 dallas    |  2016  |  25.32 san fran  |  2015  |  23.33 san fran  |  2016  |  23.97

a basic version of i'm trying is:

create procedure sppullspenddata      (@location varchar(20), @spendyear smallint)     select *     fact.spend     location = @location       , spendyear = @spendyear

but i'd @spendyear parameter optional, defaulting years if there no user input. tried few variations using subqueries, far nothing's worked out quite right. 

select     *     fact.spend     (location = @location) ,      (spendyear = @spendyear or @spendyear null)




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