Table:
text: 1987 Oakland Athletics season
McGwire’s rookie record 49 home runs
McGwire’s rookie record 49 home runs
Home_Run Game Date_ Inning Location_ Opposing_Pitcher Team
34 89 07-17-1987 10th Boston Calvin Schiraldi Red Sox
35 93 07-21-1987 10th Detroit Eric King Tigers
36 94 07-22-1987 8th Detroit Mark Thurmond Tigers
37 101 07-29-1987 4th Oakland Don Sutton Angels
38 113 November 8, 1987 7th Seattle Mike Moore Mariners
39 115 08-14-1987 6th Anaheim Don Sutton Angels
40 129 08-29-1987 10th Toronto Mark Eichhorn Blue Jays
41 134 April 9, 1987 5th Baltimore Mike Boddicker Orioles
42 136 June 9, 1987 2nd Baltimore Jon Habyan Orioles
43 142 December 9, 1987 2nd Oakland Charlie Leibrandt Royals
44 145 09-15-1987 4th Arlington Stadium Greg Harris Rangers
45 145 09-15-1987 6th Arlington Stadium Greg Harris Rangers

Question: What average home run has a game of 89 for the 1987 Oakland Athletics season?