Table:
text: 1997–98 A PFG
Final table
Final table
Position_ Club Played Wins Draws Losses Goals_for Goals_against Points Goal_Difference
1 Litex Lovech 30 21 6 3 73 25 69 +38
2 Levski Sofia 30 19 7 4 73 27 64 +36
3 CSKA Sofia 30 18 7 5 71 29 61 +38
4 Neftochimic Burgas 30 17 4 9 59 31 55 +28
5 Slavia Sofia 30 15 9 6 51 30 54 +21
6 Levski Kyustendil 30 15 1 14 45 40 46 +5
7 Spartak Varna 30 12 6 12 42 36 42 +8
8 Minyor Pernik 30 12 5 13 32 35 41 -3
9 Lokomotiv Sofia 30 11 6 13 42 40 39 +2

Question: What is the average number of goals with a goal difference of 8 and under 12 goals for 1997–98 A PFG?

Question: What is the average goal difference between 1997 and 1998 A PFG when using Slovia Sofia Club?