Task: Data-Imputation (source dataset: WebTable)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Westrail no   | Aurizon no   | Serial no   | In service     | Name(s)                                         | Notes                                                                                                                               |
|:--------------|:-------------|:------------|:---------------|:------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------|
| DB1581        | DBZ2301      | 81-989      | April 1982     | City of Bunbury                                 | nan                                                                                                                                 |
| DB1582        | DBZ2302      | [MISSING]   | May 1982       | Shire of Jarrahdale (sic)                       | nan                                                                                                                                 |
| DB1583        | DBZ2303      | 81-991      | June 1982      | Shire of Murray                                 | nan                                                                                                                                 |
| DB1584        | DBZ2304      | 81-992      | July 1982      | Shire of Waroona                                | nan                                                                                                                                 |
| DB1585        | DBZ2305      | 81-993      | August 1982    | Shire of Harvey                                 | nan                                                                                                                                 |
| DB1586        | DBZ2306      | 81-994      | September 1982 | Shire of Dardanup                               | nan                                                                                                                                 |
| DB1587        | DBZ2307      | 81-995      | October 1982   | Shire of Capel                                  | nan                                                                                                                                 |
| DB1588        | DBZ2308      | 81-996      | November 1982  | Shire of Donnybrook-Balingup                    | nan                                                                                                                                 |
| DB1589        | DBZ2309      | 81-997      | December 1982  | Shire of Bridgetown-Greenbushes                 | nan                                                                                                                                 |
| DB1590        | DBZ2310      | 81-998      | February 1983  | Shire of Collie / Shire of Manjimup             | swapped names with 2311 during overhaul                                                                                             |
| DB1591        | DBZ2311      | 82-1122     | March 1983     | Shire of Manjimup / Shire of Collie             | swapped names with 2310 during overhaul                                                                                             |
| DB1592        | DBZ2312      | 82-1123     | May 1983       | Shire of Toodyay                                | nan                                                                                                                                 |
| DB1593        | DBZ2313      | 82-1124     | May 1983       | Shire of Northam / Iron Duke / Shire of Dowerin | transferred to Australian Southern Railroad, Whyalla May 2003, renamed Iron Duke, returned August 2006 and renamed Shire of Dowerin |



row_idx: 1
col_idx: 2
col_name: Serial no
label: 81-990