CREATE TABLE table_2518850_4 (year_of_previous_participation VARCHAR2, prefecture VARCHAR2)

What was the year of previous participation for the school in the Kagoshima prefecture?
SELECT year_of_previous_participation FROM table_2518850_4 WHERE prefecture = "Kagoshima"
SELECT "year_of_previous_participation" FROM "table_2518850_4" WHERE "Kagoshima" = "prefecture"