CREATE TABLE table_14903999_1 (year INT, mixed_doubles VARCHAR)

What was the last year rni r hallgr msson dr fa har ard ttir won mixed doubles
SELECT MAX(year) FROM table_14903999_1 WHERE mixed_doubles = "Árni Þór Hallgrímsson Drífa Harðardóttir"
SELECT MAX("year") FROM "table_14903999_1" WHERE "mixed_doubles" = "Árni Þór Hallgrímsson Drífa Harðardóttir"