CREATE TABLE table_9066 ("Year  ( January ) " FLOAT, "Population  ( '000 ) " FLOAT, "Rural ,  %" FLOAT, "Urban ,  %" FLOAT, "Source" CLOB)

What was the rural % where the source estimate was census and the urban % was larger than 57?
SELECT SUM("Rural, %") FROM table_9066 WHERE "Source" = 'estimate' AND "Urban, %" > '57'
SELECT SUM("Rural, %") FROM "table_9066" WHERE "Source" = 'estimate' AND "Urban, %" > '57'