CREATE TABLE table_43343 ("Year" FLOAT, "Title" TEXT, "Label" TEXT, "RIAA Sales Certification" TEXT, "Billboard 200 Peak" FLOAT)

Before the Year 1972, what RIAA Sales Certification was awarded to the song that had a Billboard 200 Peak less than 18?
SELECT "RIAA Sales Certification" FROM table_43343 WHERE "Billboard 200 Peak" < '18' AND "Year" < '1972'
SELECT "RIAA Sales Certification" FROM "table_43343" WHERE "Billboard 200 Peak" < '18' AND "Year" < '1972'