instruction: Which country has topped the swimming medals list in the summer olympics?
context: Summary
  Games	Year	Events	Best Nation
  1	1896	4	 Hungary
  2	1900	7	 Great Britain
  3	1904	9	 Germany
  4	1908	6	 Great Britain
  5	1912	9	 Germany
  6	
  7	1920	10	 United States
  8	1924	11	 United States
  9	1928	11	 United States
  10	1932	11	 Japan
  11	1936	11	 Japan
  12	
  13	
  14	1948	11	 United States
  15	1952	11	 United States
  16	1956	13	 Australia
  Games	Year	Events	Best Nation
  17	1960	15	 United States
  18	1964	18	 United States
  19	1968	29	 United States
  20	1972	29	 United States
  21	1976	26	 United States
  22	1980	26	 East Germany
  23	1984	29	 United States
  24	1988	31	 East Germany
  25	1992	31	 United States
  26	1996	32	 United States
  27	2000	32	 United States
  28	2004	32	 United States
  29	2008	34	 United States
  30	2012	34	 United States
  31	2016	34	 United States
  32	2020	37	 United States
response: United States