Table:
text: List of United States national ice hockey team rosters
Men's Olympics
1984 Winter Olympics
Position_ Jersey_ Name_ Height_cm Weight_kg Birthdate Birthplace Previous_Club_Team
D 28 David H. Jensen 185 86 3 May 1961 Minneapolis, Minnesota Birmingham South Stars ( CHL )
F 17 Scott Bjugstad 185 84 2 June 1961 Minneapolis, Minnesota University of Minnesota
F 13 Bob Brooke 188 94 18 December 1960 Melrose, Massachusetts Yale University
F 9 Scott Fusco 175 79 21 January 1963 Woburn, Massachusetts Harvard University
F 10 Steve Griffith 178 84 12 March 1961 Saint Paul, Minnesota University of Minnesota
F 19 Paul Guay 183 88 2 September 1963 Woonsocket, Rhode Island Providence College
F 23 John Harrington 178 82 24 May 1957 Virginia, Minnesota University of Minnesota-Duluth

text: List of United States national ice hockey team rosters
Men's Olympics
1984 Winter Olympics
Position_ Jersey_ Name_ Height_cm Weight_kg Birthdate Birthplace Previous_Club_Team
G 29 Marc Behrend 185 84 11 January 1961 Madison, Wisconsin University of Wisconsin
G 1 Bob Mason 185 82 22 April 1961 International Falls, Minnesota University of Minnesota-Duluth
D 21 Chris Chelios 185 86 25 January 1962 Evergreen Park, Illinois University of Wisconsin
D 6 Mark Fusco 175 82 12 March 1961 Woburn, Massachusetts Harvard University
D 22 Tom Hirsch 193 95 27 January 1963 Minneapolis, Minnesota University of Minnesota
D 18 Al Iafrate 190 86 21 March 1966 Dearborn, Michigan Belleville Bulls ( OHL )

Question: What was Steve Griffith's average jersey number on the 1984 Winter Olympics US national ice hockey team roster when his weight (kg) was less than 84?