CREATE TABLE table_30475 ("Club" TEXT, "Location" TEXT, "Home Venue" TEXT, "Capacity" TEXT, "Founded" FLOAT, "Years Active" TEXT)

How long has the team who owns North Shore Events Centre Vector Arena been active?
SELECT "Years Active" FROM table_30475 WHERE "Home Venue" = 'North Shore Events Centre Vector Arena'
SELECT "Years Active" FROM "table_30475" WHERE "Home Venue" = 'North Shore Events Centre Vector Arena'