CREATE TABLE table_203_168 (id NUMBER, "team name" CLOB, "leagues" CLOB, "base" CLOB, "year started" CLOB, "year ended" CLOB, "notable riders" CLOB)

how many teams were ended in the last ten years ?
SELECT COUNT("team name") FROM table_203_168 WHERE "year ended" >= present_ref - 10
SELECT COUNT("team name") FROM "table_203_168" WHERE "year ended" >= "present_ref" - 10