How are these numbers calculated?

Big Games

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

Week of 10/12100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Timbers 1 Sounders 0 -0.2
-8.2
-0.4
Galaxy 1 Impact 0 -0.1
-0.1
Sporting KC 1 DC United 0 -0.6
Impact 0 New England 1 +0.3
Week of 10/19100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Galaxy 0 Earthquakes 0 In
+0.3
FC Dallas 2 Sounders 0 -0.4
No
-0.4
Rapids 3 Whitecaps 2 -0.3
-0.1
Timbers 0 Real Salt Lake 0 +2.6
+0.1
Real Salt Lake 2 Chivas USA 1 -0.1
Week of 10/26100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Sounders 1 Galaxy 1 -0.4
Whitecaps 3 Rapids 0 +0.2
Chivas USA 0 Timbers 5 -0.1
Points
Chance Will Make Playoffs