CREATE TABLE table_14903491_1 (year VARCHAR(255), womens_doubles VARCHAR(255), mens_singles VARCHAR(255))
Name the number of years for womens doubles being  diana koleva emilia dimitrova and  jeliazko valkov
    
SQL: SELECT COUNT(year) FROM table_14903491_1 WHERE womens_doubles = "Diana Koleva Emilia Dimitrova" AND mens_singles = "Jeliazko Valkov"