Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Season | Competition | Round | Club | Home | Away | Aggregate |
| --- | --- | --- | --- | --- | --- | --- |
| 2003 | UEFA Intertoto Cup | R1 | WIT Georgia | 1-0 | 1-2 | 2-2 |
|  |  | R2 | FK Pobeda | 2-1 | 1-1 | 3-2 |
|  |  | R3 | Tobol Kostanay | 3-0 | 1-0 | 4-0 |
|  |  | Semifinals | Werder Bremen | 4-0 | 1-1 | 5-1 |
|  |  | Finals | FC Schalke 04 | 0-2 | 0-0 | 0-2 |
| 2004/05 | UEFA Cup | Q2 | Zenit St. Petersburg | 3-1 | 0-2 | 3-3 |
| 2005/06 | UEFA Cup | Q2 | Zenit St. Petersburg | 2-2 | 1-1 | 3-3 |
| 2006/07 | UEFA Cup | 1 | Livorno | 0-1 | 0-2 | 0-3 |
Question:
what is the difference in the amount of home games won versus home games lost for werder bremen?
Answer:
4