CREATE TABLE table_64200 ("Province" TEXT, "Inhabitants" FLOAT, "established" FLOAT, "President" TEXT, "Party" TEXT, "Election" FLOAT)

What is the average election result for the province of Grosseto from 1766 and prior?
SELECT AVG("Election") FROM table_64200 WHERE "Province" = 'grosseto' AND "established" < '1766'
SELECT AVG("Election") FROM "table_64200" WHERE "Province" = 'grosseto' AND "established" < '1766'