CREATE TABLE table_14903491_1 (year VARCHAR, womens_doubles VARCHAR, mens_singles VARCHAR)

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