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:
| Year | Team | Number | BB +HBP | BA (Place) |
| --- | --- | --- | --- | --- |
| 1984 | Seibu Lions | 5 | 11.0 | .209 |
| 1985 | Seibu Lions | 5 | 39.0 | .275 |
| 1986 | Seibu Lions | 5 | 44.0 | .296（13） |
| 1987 | Seibu Lions | 5 | 7.0 | .200 |
| 1988 | Seibu Lions | 5 | 31.0 | .263（23） |
| 1989 | Seibu Lions | 5 | 39.0 | .304（7） |
| 1990 | Seibu Lions | 5 | 53.0 | .266（22） |
| 1991 | Seibu Lions | 5 | 51.0 | .271（14） |
| 1992 | Seibu Lions | 5 | 67.0 | .285（14） |
| 1993 | Seibu Lions | 5 | 57.0 | .319（1） |
| 1994 | Seibu Lions | 5 | 39.0 | .294（8） |
| 1995 | Seibu Lions | 5 | 49.0 | .238 |
| 1996 | Yakult Swallows | 8 | 53.0 | .333（2） |
| 1997 | Yakult Swallows | 8 | 22.0 | .262 |
| 1998 | Yakult Swallows | 8 | 12.0 | .304 |
| 1999 | Yakult Swallows | 8 | 6.0 | .196 |
| Carer Total | Carer Total | Carer Total | 580.0 | .282 |
Question:
The year that has a BB + HBP of 51 is listed as?
Answer:
1991.0