CREATE TABLE table_204_95 (id DECIMAL, "name" TEXT, "title" TEXT, "first year\ in this position" DECIMAL, "years at nebraska" TEXT, "alma mater" TEXT)

how many consecutive years did biff jones coach ?
SELECT "years at nebraska" - "years at nebraska" FROM table_204_95 WHERE "name" = 'biff jones'
SELECT "years at nebraska" - "years at nebraska" FROM "table_204_95" WHERE "name" = 'biff jones'