CREATE TABLE table_41304 ("Team" TEXT, "University" TEXT, "Location" TEXT, "Year entered league" FLOAT, "2013\\u201314 division" TEXT)

What is the year of entry for the University of Essex?
SELECT "Year entered league" FROM table_41304 WHERE "University" = 'university of essex'
SELECT "Year entered league" FROM "table_41304" WHERE "University" = 'university of essex'