Eligibility for participation in the program shall be limited to a resident who is enrolled in Medicare Part B whose annual income does not exceed forty-three thousand five hundred sixty dollars or if such resident has a spouse, the combined income of such resident and his spouse does not exceed fifty-eight thousand seven hundred forty dollars. On January 1, 2014, and annually thereafter, the commissioner shall increase the income limit established under this subsection over that of the previous fiscal year to reflect the annual inflation adjustment in Social Security income, if any. Each such adjustment shall be determined to the nearest one hundred dollars.