Joe,
first of all, Courteney is right: Don't worry about the average, just have fun in playing!
That said, I can't calculate your average either though I'm quite good at it.
Scores from 6-11 on count in, when you were promoted. Fortunately, we need not know about the scores from that date because they are too high. Exclude the Criquet Cup (Par3) and the Par5, double the 9-holers, sort by score - a nice row of 32 scores from 64 to 76, starting 6-12.
Your average should be saturated by now.
The best 25 scores are 69.16 in average, (best 30 = 70). Furtheron, no number at all would justify 69.60 from your profile.
You played no matches until now, I see no credit wins -and they would drop the average, not raise it.
=>> An unpredicted result!