CREATE TABLE table_11393 ("Data" TEXT, "Total gain" TEXT, "Percent gain" TEXT, "2003" TEXT, "2000" TEXT, "1997" TEXT, "1994" TEXT, "1991" TEXT, "1988" TEXT, "1985" TEXT, "1982" TEXT, "1979" TEXT, "1976" TEXT, "1973" TEXT, "1970" TEXT, "1967" TEXT)

Name the data with a percent gain of 28.4%
SELECT "Data" FROM table_11393 WHERE "Percent gain" = '28.4%'
SELECT "Data" FROM "table_11393" WHERE "Percent gain" = '28.4%'