CREATE TABLE table_29345 ("Rank" FLOAT, "Total USD" FLOAT, "Project name" TEXT, "Creator" TEXT, "Category" TEXT, "% funded" FLOAT, "Backers" FLOAT, "Closing date" TEXT)

What was the minimum % funded of the project that was closed on 2012-05-18?
SELECT MIN("% funded") FROM table_29345 WHERE "Closing date" = '2012-05-18'
SELECT MIN("% funded") FROM "table_29345" WHERE "Closing date" = '2012-05-18'