CREATE TABLE table_75147 ("INEGI code" FLOAT, "Municipality" TEXT, "Municipal Seat" TEXT, "Area  ( km 2  ) " FLOAT, "Population  ( 2005 ) " FLOAT, "Population density  ( /km 2  ) " FLOAT, "Human Development Index  ( 2000 ) " FLOAT)

WHich INEGI code has a Population density (/km 2 ) smaller than 81.4 and 0.6593 Human Development Index (2000)?
SELECT AVG("INEGI code") FROM table_75147 WHERE "Population density (/km 2 )" < '81.4' AND "Human Development Index (2000)" = '0.6593'
SELECT AVG("INEGI code") FROM "table_75147" WHERE "Human Development Index (2000)" = '0.6593' AND "Population density (/km 2 )" < '81.4'