CREATE TABLE table_21685 ("School" TEXT, "Years of Participation" TEXT, "OCC Championships" FLOAT, "Last OCC Championship" TEXT, "Last Outright OCC Championship" TEXT)

What are the years of participation for pickerington north?
SELECT "Years of Participation" FROM table_21685 WHERE "School" = 'Pickerington North'
SELECT "Years of Participation" FROM "table_21685" WHERE "School" = 'Pickerington North'