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:
| County | Town/City | Milepost | Station | Connections |
| --- | --- | --- | --- | --- |
| Fairfield | Stratford | 59.0 | Stratford (Limited service) | Shore Line East GBTA : 1, 10, 16, 23, Coastal Link |
| New Haven | Milford | Waterbury Branch splits | Waterbury Branch splits | Waterbury Branch splits |
| New Haven | Derby | 69.5 | Derby–Shelton | GBTA :15, 23 CTTransit New Haven : F |
| New Haven | Ansonia | 71.1 | Ansonia | CTTransit New Haven : F |
| New Haven | Seymour | 75 | Seymour | CTTransit New Haven : F |
| New Haven | Beacon Falls | 78.5 | Beacon Falls | N/A |
| New Haven | Naugatuck | 82.5 | Naugatuck | CTTransit Waterbury : N1 |
Question:
How many counties are at milepost 69.5? 
Answer:
1.0