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SET DATEFIRST 1;
DECLARE @from_date date
DECLARE @to_date date;
DECLARE @noModificationYears nvarchar(max);
SET @from_date = '2018-01-01';
SET @to_date = '2020-12-31';
;with CTE As  
		(  
			SELECT DATEADD(day, 0, @from_date) AS the_date
			UNION ALL  
			SELECT DATEADD(day, 1, the_date) AS TheDate FROM CTE  
			WHERE the_date < @to_date

		)
		SELECT 
			@noModificationYears = (
				SELECT 
                CONCAT(DATEPART(year, the_date), ',')
				FROM CTE GROUP BY DATEPART(week, the_date), DATEPART(year, the_date) 
					HAVING COUNT(DATEPART(year, the_date)) = 7 AND DATEPART(week, the_date) = '1' 
					FOR XML PATH('')
			)
		OPTION (MAXRECURSION 0);
Select @noModificationYears as years;

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edited aug 6

created aug 1 anonymous