CREATE TABLE table_34644 ("Year" FLOAT, "US Cham. Rank" FLOAT, "US Cham. Spending" TEXT, "Next Highest Spender" TEXT, "Next Highest Amount" TEXT)

Which US Cham Rank is the lowest one that has a Next Highest Spender of national assn of realtors, and a Year smaller than 2012?
SELECT MIN("US Cham. Rank") FROM table_34644 WHERE "Next Highest Spender" = 'national assn of realtors' AND "Year" < '2012'
SELECT MIN("US Cham. Rank") FROM "table_34644" WHERE "Next Highest Spender" = 'national assn of realtors' AND "Year" < '2012'