When through 2001 to 2002 the duration is 0.5 what is the term abroad?
CREATE TABLE "duration" (
  "term_abroad" text,
  "2000_01" text,
  "2001_02" text,
  "2002_03" text,
  "2003_04" text,
  "2004_05" text,
  "2005_06" text,
  "2006_07" text,
  "2007_08" text,
  "2008_09" text
);
SELECT "term_abroad" FROM "duration" WHERE "2001_02"='0.5';