GROUP BY TO appear IN one row THEN Calculate total and AVG

Hi
I currently when i run my query i get the following output.

**Current**
|year|Weeks|Won|Lost|
|---|---|---|---|
|2017|48|4|NULL|
|2017|49|NULL|2|
|2017|49|7|NULL|
|2017|50|NULL|8|
|2017|50|19|NULL

As y