user: Question: What is the number of nationality in 1992?
Columns: ['Player', 'Nationality', 'Finals', 'Win-Loss', 'Year(s)']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Billie Jean King Category:Articles with hCards', 'United States', 6.0, '4–2', '1968 *, 1969 , 1970 , 1972 *, 1973 *, 1975 *']
SQL:

assistant: SELECT COUNT("Nationality") FROM "Table" WHERE "Year(s)" = '1992';