How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 7/30100.0*Wooden Spoon100.0*Average seed
Canterbury 5 Dunedin 3 -17.5
+0.2
Canterbury 4 Dunedin 3 -17.4
+0.2
Week of 8/6100.0*Wooden Spoon100.0*Average seed
Dunedin 0 Canterbury 5 -21.8
+0.2
Dunedin 3 Canterbury 1 +14.8
-0.2
Dunedin 1 Queenstown 3 -7.3
+0.1
Dunedin 9 Auckland 2 +5.7
-0.1
Queenstown 7 Canterbury 4 +4.9
Week of 8/13100.0*Wooden Spoon100.0*Average seed
Auckland 5 Canterbury 4 +36.5
-0.4
Dunedin 2 Canterbury 1 +25.4
-0.3
Points
Chance Will Win Championship