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:
| Number | TMS Number | Builder | Year built | Carriage type |
| --- | --- | --- | --- | --- |
| A 595 | A 50702 | NZR Addington | 1900.0 | 47' 6" 'Birdcage' gallery coach |
| A 1255 | A 50729 | NZR Addington | 1913.0 | 47' 6" passenger coach |
| A 1518 | A 50737 | NZR Addington | 1923.0 | 47' 6" passenger coach |
| A 1521 | A 50745 | NZR Addington | 1923.0 | 47' 6" passenger coach |
| A A 1132 | A 50710 | NZR Petone | 1919.0 | 47' 6" passenger/refreshments coach |
| A F 950 | AF 35 | NZR Hillside | 1906.0 | 47' 6" car-van |
Question:
What year was the carriage type is 47' 6" 'birdcage' gallery coach built
Answer:
1900.0