CREATE TABLE table_31784 ("Year" CLOB, "Men's Singles" CLOB, "Women's Singles" CLOB, "Men's Doubles" CLOB, "Women's Doubles" CLOB, "Mixed Doubles" CLOB)

In what year did Stephan Wojcikiewicz play men's single and Anna Rice play women's single?
SELECT "Year" FROM table_31784 WHERE "Men's Singles" = 'stephan wojcikiewicz' AND "Women's Singles" = 'anna rice'
SELECT "Year" FROM "table_31784" WHERE "Men's Singles" = 'stephan wojcikiewicz' AND "Women's Singles" = 'anna rice'