user: Question: What is canada's highest round before 1973?
Columns: ['Draft', 'Round', 'Pick', 'Player', 'Nationality']
Types: ['real', 'real', 'real', 'text', 'text']
Sample row: [1973.0, 1.0, 2.0, 'Glenn Goldup Category:Articles with hCards', 'Canada']
SQL:

assistant: SELECT MAX("Round") FROM "Table" WHERE "Nationality" = 'canada' AND "Draft" < 1973.0;