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:
| Pick # | Player | Position | Nationality | NHL team | College/junior/club team |
| --- | --- | --- | --- | --- | --- |
| 29.0 | Rich Leduc | Centre | Canada | California Golden Seals | Trois-Rivières Draveurs (QMJHL) |
| 30.0 | Ralph Hopiavouri | Defence | Canada | Toronto Maple Leafs | Toronto Marlboros (OHA) |
| 31.0 | Jim Cahoon | Centre | Canada | Montreal Canadiens | University of North Dakota (WCHA) |
| 32.0 | Joe Noris | Defence | United States | Pittsburgh Penguins | Toronto Marlboros (OHA) |
| 33.0 | Bill Hajt | Defence | Canada | Buffalo Sabres | Saskatoon Blades (WCHL) |
| 34.0 | Vic Venasky | Centre | Canada | Los Angeles Kings | University of Denver (WCHA) |
| 35.0 | Ron Wilson | Defence | Canada | Minnesota North Stars | Flin Flon Bombers (WCHL) |
| 36.0 | Glen Irwin | Defence | Canada | Philadelphia Flyers | Estevan Bruins (WCHL) |
| 37.0 | Gavin Kirk | Centre | Canada | Toronto Maple Leafs | Toronto Marlboros (OHA) |
| 38.0 | John Garrett | Goaltender | Canada | St. Louis Blues | Peterborough Petes (OHA) |
| 39.0 | Richard Lemieux | Centre | Canada | Vancouver Canucks | Montreal Junior Canadiens (OHA) |
| 40.0 | Bob Peppler | Left Wing | Canada | Chicago Black Hawks | St Catharines Black Hawks (OHA) |
| 41.0 | Terry West | Centre | Canada | New York Rangers | London Knights (OHA) |
| 42.0 | Dave Bonter | Centre | Canada | Boston Bruins | Estevan Bruins (WCHL) |
Question:
How many nationalities are listed for the player Glen Irwin?
Answer:
1.0