the colname variable looks right, but the year variable is wrong.
the year variable has the run time value set to:
$_GET['fieldset_Category_Category']
but your link is passing the year as a variable named year, not named fieldset_Category_Category. the run time value should be:
$_GET['year']
also, the data type for the year variable is set to Integer. the value you are passing is not an integer:
2011-2125
an integer cannot contain any characters that are not numbers, like the dash.