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:
| Position | Name | Height | Weight | Birthdate | Birthplace | 2009–10 team |
| --- | --- | --- | --- | --- | --- | --- |
| G | Brianne McLaughlin | 174 cm (5 ft 9 in) | 59 kg (130 lb) | June 20, 1987 | Sheffield, Ohio | Robert Morris Colonials |
| G | Molly Schaus | 174 cm (5 ft 9 in) | 67 kg (148 lb) | July 29, 1988 | Natick, Massachusetts | Boston Eagles |
| G | Jessie Vetter | 174 cm (5 ft 9 in) | 77 kg (170 lb) | December 19, 1985 | Cottage Grove, Wisconsin | Wisconsin Badgers |
| D | Kacey Bellamy | 174 cm (5 ft 9 in) | 65 kg (143 lb) | April 22, 1987 | Westfield, Massachusetts | New Hampshire Wildcats |
| D | Caitlin Cahow | 163 cm (5 ft 4 in) | 71 kg (157 lb) | May 20, 1985 | New Haven, Connecticut | Harvard Crimson |
| D | Lisa Chesson | 169 cm (5 ft 7 in) | 69 kg (152 lb) | August 18, 1986 | Plainfield, Illinois | Ohio State Buckeyes |
| D | Molly Engstrom | 175 cm (5 ft 9 in) | 81 kg (179 lb) | March 1, 1983 | Siren, Wisconsin | Wisconsin Badgers |
| D | Angela Ruggiero – A | 175 cm (5 ft 9 in) | 87 kg (192 lb) | January 3, 1980 | Los Angeles, California | Harvard Crimson |
| D | Kerry Weiland | 163 cm (5 ft 4 in) | 64 kg (141 lb) | October 18, 1980 | Palmer, Alaska | Wisconsin Badgers |
| F | Julie Chu – A | 174 cm (5 ft 9 in) | 67 kg (148 lb) | March 13, 1982 | Bridgeport, Connecticut | Harvard Crimson |
| F | Natalie Darwitz – C | 160 cm (5 ft 3 in) | 62 kg (137 lb) | October 13, 1983 | Eagan, Minnesota | Minnesota Golden Gophers |
| F | Meghan Duggan | 175 cm (5 ft 9 in) | 74 kg (163 lb) | September 3, 1987 | Danvers, Massachusetts | Wisconsin Badgers |
| F | Hilary Knight | 178 cm (5 ft 10 in) | 78 kg (172 lb) | July 12, 1989 | Hanover, New Hampshire | Wisconsin Badgers |
| F | Jocelyne Lamoureux | 168 cm (5 ft 6 in) | 70 kg (150 lb) | July 3, 1989 | Grand Forks, North Dakota | North Dakota Fighting Sioux |
| F | Monique Lamoureux | 168 cm (5 ft 6 in) | 71 kg (157 lb) | July 3, 1989 | Grand Forks, North Dakota | North Dakota Fighting Sioux |
| F | Erika Lawler | 152 cm (5 ft 0 in) | 59 kg (130 lb) | February 5, 1987 | Fitchburg, Massachusetts | Wisconsin Badgers |
| F | Gisele Marvin | 174 cm (5 ft 9 in) | 75 kg (165 lb) | March 7, 1987 | Warroad, Minnesota | Minnesota Golden Gophers |
| F | Jenny Potter – A | 163 cm (5 ft 4 in) | 66 kg (146 lb) | January 12, 1979 | Edina, Minnesota | Minnesota Golden Gophers |
| F | Kelli Stack | 165 cm (5 ft 5 in) | 59 kg (130 lb) | January 13, 1988 | Brooklyn Heights, Ohio | Boston Eagles |
| F | Karen Thatcher | 174 cm (5 ft 9 in) | 74 kg (163 lb) | February 29, 1984 | Blaine, Washington | Providence Friars |
| F | Jinelle Zaugg-Siergiej | 183 cm (6 ft 0 in) | 82 kg (181 lb) | March 27, 1986 | Eagle River, Wisconsin | Wisconsin Badgers |
Question:
what is total number of birthday?
Answer:
21