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:
| Rank | Railway Station | Annual entry/exit (millions) 2011–12 | Annual interchanges (millions) 2011–12 | Total Passengers (millions) 2011–12 | Location | Number of Platforms |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | London Waterloo | 94.046 | 9.489 | 103.534 | London | 19.0 |
| 2.0 | London Victoria | 76.231 | 9.157 | 85.38 | London | 19.0 |
| 3.0 | London Bridge | 52.634 | 8.742 | 61.376 | London | 12.0 |
| 4.0 | London Liverpool Street | 57.107 | 2.353 | 59.46 | London | 18.0 |
| 5.0 | Clapham Junction | 21.918 | 21.61 | 43.528 | London | 17.0 |
| 6.0 | London Euston | 36.609 | 3.832 | 40.44 | London | 18.0 |
| 7.0 | London Charing Cross | 38.005 | 1.99 | 39.995 | London | 6.0 |
| 8.0 | London Paddington | 33.737 | 2.678 | 36.414 | London | 14.0 |
| 9.0 | Birmingham New Street | 31.214 | 5.118 | 36.331 | Birmingham | 13.0 |
| 10.0 | London King's Cross | 27.875 | 3.022 | 30.896 | London | 12.0 |
| 11.0 | Glasgow Central | 26.639 | 3.018 | 29.658 | Glasgow | 17.0 |
| 12.0 | Leeds | 25.02 | 2.639 | 27.659 | Leeds | 17.0 |
| 13.0 | East Croydon | 20.551 | 6.341 | 26.892 | London | 6.0 |
| 14.0 | London St Pancras | 22.996 | 3.676 | 26.672 | London | 15.0 |
| 15.0 | Stratford | 21.797 | 2.064 | 23.862 | London | 15.0 |
| 16.0 | Edinburgh Waverley | 22.585 | 1.143 | 23.728 | Edinburgh | 18.0 |
| 17.0 | Glasgow Queen Street | 20.93 | 1.56 | 22.489 | Glasgow | 9.0 |
| 18.0 | Manchester Piccadilly | 18.585 | 3.796 | 22.381 | Manchester | 14.0 |
| 19.0 | London Cannon Street | 20.152 | 0.441 | 20.593 | London | 7.0 |
| 20.0 | Wimbledon | 18.246 | 1.591 | 19.836 | London | 10.0 |
| 21.0 | Reading | 15.276 | 3.794 | 19.07 | Reading | 15.0 |
| 22.0 | Vauxhall | 18.158 | 0.0 | 18.158 | London | 8.0 |
| 23.0 | Brighton | 16.051 | 1.859 | 17.91 | Brighton | 8.0 |
| 24.0 | London Fenchurch Street | 17.021 | 0.345 | 17.366 | London | 4.0 |
| 25.0 | Gatwick Airport | 14.758 | 1.115 | 15.873 | Gatwick Airport | 6.0 |
| 26.0 | London Marylebone | 14.41 | 0.439 | 14.849 | London | 6.0 |
| 27.0 | Liverpool Central | 14.209 | 0.412 | 14.622 | Liverpool | 3.0 |
| 28.0 | Liverpool Lime Street | 13.835 | 0.778 | 14.613 | Liverpool | 10.0 |
| 29.0 | London Blackfriars | 12.79 | 1.059 | 13.85 | London | 4.0 |
| 30.0 | Highbury and Islington | 11.801 | 1.971 | 13.772 | London | 8.0 |
Question:
What's the highest annual interchange for wimbledon railway station?
Answer:
1.591