Table: income_inequality_us
Columns: data
total_gain
percent_gain
2003
2000
1997
1994
1991
1988
1985
1982
1979
1976
1973
1970
1967

Question: Name the data with a percent gain of 28.4%
SQL: SELECT "data" FROM income_inequality_us WHERE "percent_gain" = '28.4%'