Context: CREATE TABLE table_14903491_1 (year VARCHAR, womens_doubles VARCHAR, mens_singles VARCHAR)
Question: Name the number of years for womens doubles being  diana koleva emilia dimitrova and  jeliazko valkov
Answer: SELECT COUNT(year) FROM table_14903491_1 WHERE womens_doubles = "Diana Koleva Emilia Dimitrova" AND mens_singles = "Jeliazko Valkov"