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:
| Name | Design | Manufacturer | Acquired | Disposed |
| --- | --- | --- | --- | --- |
| Adler | 1A1 | Stephenson 1835 | 1835.0 | sold 1857 |
| Pfeil | 1A1 | Stephenson 1836 | 1836.0 | sold |
| Nürnberg-Fürth | 1A1 | Henschel 1852/14 | 1852.0 | scrapped 1889 |
| Phoenix | 1A1 | Maffei 1853/127 | 1853.0 | scrapped 1869 |
| Adler II | 1A1 | Maffei 1857/279 | 1857.0 | scrapped 1889 |
| Johannes Scharrer | 1A1 | Henschel 1865/108 | 1865.0 | scrapped 1887 |
| Faust | 1A1 | Maffei 1845/6 | 1872.0 | scrapped 1881 |
| Henlein | 1A1 | Maffei 1845/8 | 1873.0 | scrapped 1880 |
| Wallenstein | 1A1 | Kessler 1845/30 | 1875.0 | scrapped 1885 |
| Bavaria | Bn2t | Maffei 1879/1204 | 1879.0 | sold 1923 |
| Pegnitz | Bn2t | Maffei 1880/1224 | 1880.0 | sold 1923 |
| Franconia | Bn2t | Maffei 1881/1248 | 1881.0 | sold 1923 |
| Daniel Ley | 1Bn2t | Maffei 1886/1414 | 1886.0 | sold 1923 |
| Johannes Scharrer II | Bn2t | Maffei 1887/1453 | 1887.0 | sold 1923 |
| Nürnberg-Fürth II | Bn2t | Maffei 1889/1538 | 1889.0 | sold 1923 |
| Germania | 1Bn2t | Maffei 1906/2511 | 1906.0 | sold 1923 |
| Ludwig | 1Bn2t | Maffei 1906/2549 | 1906.0 | sold 1923 |
Question:
What is the average year for Wallenstein with 1a1 design?
Answer:
1875.0