Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Time | Athlete | Nationality | Location of race | Date |
| --- | --- | --- | --- | --- |
| 20.6y | Andy Stanfield | United States | Philadelphia , United States | May 26, 1951 |
| 20.6 | Andy Stanfield | United States | Los Angeles , United States | June 28, 1952 |
| 20.6 | Thane Baker | United States | Bakersfield , United States | June 23, 1956 |
| 20.6 | Bobby Morrow | United States | Melbourne , Australia | November 27, 1956 |
| 20.6 | Manfred Germar | West Germany | Wuppertal , Germany | October 1, 1958 |
| 20.6y | Ray Norton | United States | Berkeley , United States | March 19, 1960 |
| 20.6 | Ray Norton | United States | Philadelphia , United States | April 30, 1960 |
| 20.5y | Peter Radford | United Kingdom | Wolverhampton , United Kingdom | May 28, 1960 |
| 20.5 | Stone Johnson | United States | Stanford , United States | July 2, 1960 |
| 20.5 | Ray Norton | United States | Stanford , United States | July 2, 1960 |
| 20.5 | Livio Berruti | Italy | Rome , Italy | September 3, 1960 |
| 20.5y | Paul Drayton | United States | Walnut , United States | June 23, 1962 |
| 20.3y | Henry Carr | United States | Tempe , United States | March 23, 1963 |
| 20.2y | Henry Carr | United States | Tempe , United States | April 4, 1964 |
| 20.0y | Tommie Smith | United States | Sacramento , United States | June 11, 1968 |
| 19.8A | Tommie Smith | United States | Mexico City , Mexico | October 16, 1968 |
| 19.8A | Donald Quarrie | Jamaica | Cali , Colombia | August 3, 1971 |
| 19.8+ | Donald Quarrie | Jamaica | Eugene, Oregon , United States | June 7, 1975 |
Question:
What's the nationality of Henry Carr having a time of 20.3y?
Answer:
United States