The following SQL will generate the list for you which you can then use as the datasource for your dropdown list
;WITH CTE AS
(
SELECT YEAR(GETDATE()) - 1 AS d
UNION ALL
SELECT d + 1
FROM CTE
WHERE d < YEAR(GETDATE()) + 30
)
SELECT CAST(D AS VARCHAR) + '-' + CAST(D+1 AS VARCHAR)
FROM CTE
It starts from last year. Change the
30
to whatever your maximum number of years should be