SCHEMA:
CREATE TABLE table_name_92 (year INTEGER, group VARCHAR, award VARCHAR, result VARCHAR, film_series VARCHAR)
USER:
What is the average year in which Kim was nominated for Thirst as Best Actress at the Baeksang Arts Awards?

QUERY:
SELECT AVG(year) FROM table_name_92 WHERE result = "nominated" AND film_series = "thirst" AND award = "best actress" AND group = "baeksang arts awards"