Table:
text: Phoenix Suns all-time roster
G
G
Player Pos_ From_ School_Country Rebs Asts
Rubén Garcés Category:Articles with hCards PF 2000 Providence 22 4
Diante Garrett Category:Articles with hCards G 2012 Iowa State 15 31
Pat Garrity Category:Articles with hCards PF 1998 Notre Dame 75 18
Kenny Gattison Category:Articles with hCards PF 1986 Old Dominion 271 36
Armen Gilliam Category:Articles with hCards PF 1987 UNLV 1045 132
Gordan Giriček Category:Articles with hCards G/F 2008 Croatia 51 35
Georgi Glouchkov Category:Articles with hCards PF 1985 Bulgaria 163 32
Grant Gondrezick Category:Articles with hCards SG 1986 Pepperdine 110 81
Gail Goodrich Category:Articles with hCards PG 1968 UCLA 777 1123

Question: what are the average rebounds for the player who started in 1986 and plays sg for the all-time phoenix suns groster?