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:
| Station | Year opened | Metropolitan borough [c ] | Zone | Servedby Route maps:- [ dead link ] [ dead link ] | Station users 2006–07 | Station users 2007–08 |
| --- | --- | --- | --- | --- | --- | --- |
| Acocks Green | 1852 | Birmingham | 3.0 | Chiltern Railways London Midland | 160100.0 | 161400.0 |
| Adderley Park | 1860 | Birmingham | 2.0 | London Midland | 19500.0 | 20400.0 |
| Aston | 1854 | Birmingham | 2.0 | London Midland | 167700.0 | 206300.0 |
| Berkswell | 1884 | Solihull | 5.0 | London Midland | 112000.0 | 114100.0 |
| Bescot Stadium | 1847 | Sandwell | 4.0 | London Midland | 55000.0 | 48200.0 |
| Birmingham Moor Street | 1909 | Birmingham | 1.0 | Chiltern Railways London Midland | 2680800.0 | 687400.0 |
| Birmingham Snow Hill | 1852 [d ] | Birmingham | 1.0 | Chiltern Railways London Midland Midland Metro | 1939000.0 | 2407300.0 |
| Blake Street | 1884 | Birmingham | 5.0 | London Midland | 175900.0 | 184000.0 |
| Bloxwich | 1989 | Walsall | 5.0 | London Midland | 21100.0 | 24000.0 |
| Bloxwich North | 1990 | Walsall | 5.0 | London Midland | 23800.0 | 26600.0 |
| Bordesley | 1855 | Birmingham | 2.0 | London Midland | 3700.0 | 4000.0 |
| Bournville | 1876 | Birmingham | 3.0 | London Midland | 405900.0 | 466900.0 |
| Butlers Lane | 1957 | Birmingham | 5.0 | London Midland | 96000.0 | 103000.0 |
| Canley | 1940 | Coventry | 5.0 | London Midland | 77900.0 | 90000.0 |
| Chester Road | 1863 | Birmingham | 3.0 | London Midland | 266700.0 | 296200.0 |
| Coseley | 1852 [e ] | Dudley | 5.0 | London Midland | 117200.0 | 126600.0 |
| Coventry | 1838 | Coventry | 5.0 | CrossCountry London Midland Virgin Trains | 2874900.0 | 3039500.0 |
| Cradley Heath | 1863 | Sandwell | 5.0 | Chiltern Railways London Midland | 242500.0 | 288300.0 |
| Dorridge | 1852 | Solihull | 5.0 | Chiltern Railways London Midland | 300800.0 | 304500.0 |
| Duddeston | 1837 | Birmingham | 2.0 | London Midland | 55700.0 | 59900.0 |
| Dudley Port | 1852 [f ] | Sandwell | 4.0 | London Midland | 144300.0 | 155200.0 |
| Earlswood [a ] | 1908 | Solihull | 5.0 | London Midland | 38400.0 | 32400.0 |
| Erdington | 1862 | Birmingham | 3.0 | London Midland | 299100.0 | 336000.0 |
| Five Ways | 1885 [g ] | Birmingham | 1.0 | London Midland | 514400.0 | 563900.0 |
| Four Oaks | 1884 | Birmingham | 5.0 | London Midland | 251000.0 | 276600.0 |
| Gravelly Hill | 1862 | Birmingham | 2.0 | London Midland | 199900.0 | 231400.0 |
| Hall Green | 1908 | Birmingham | 3.0 | London Midland | 143500.0 | 139400.0 |
| Hampton-in-Arden | 1837 [h ] | Solihull | 5.0 | London Midland | 54900.0 | 57300.0 |
| Hamstead | 1862 | Birmingham | 3.0 | London Midland | 67100.0 | 69500.0 |
| Jewellery Quarter | 1995 | Birmingham | 1.0 | Chiltern Railways London Midland Midland Metro | 108700.0 | 116800.0 |
| Kings Norton | 1849 | Birmingham | 3.0 | London Midland | 447500.0 | 481400.0 |
| Langley Green | 1885 | Sandwell | 3.0 | Chiltern Railways London Midland | 57900.0 | 60900.0 |
| Lea Hall | 1939 | Birmingham | 3.0 | London Midland | 146800.0 | 141200.0 |
| Longbridge | 1978 [i ] | Birmingham | 4.0 | London Midland | 342800.0 | 373300.0 |
| Lye | 1863 | Dudley | 5.0 | Chiltern Railways London Midland | 40400.0 | 46400.0 |
| Marston Green | 1844 | Solihull | 4.0 | London Midland | 183000.0 | 182200.0 |
| Northfield | 1870 | Birmingham | 4.0 | London Midland | 305800.0 | 333100.0 |
| Old Hill | 1866 | Sandwell | 4.0 | Chiltern Railways London Midland | 79000.0 | 83100.0 |
| Olton | 1869 | Solihull | 4.0 | Chiltern Railways London Midland | 140200.0 | 143100.0 |
| Perry Barr | 1837 | Birmingham | 2.0 | London Midland | 164100.0 | 172600.0 |
| Rowley Regis | 1867 | Sandwell | 3.0 | Chiltern Railways London Midland | 295900.0 | 325000.0 |
| Sandwell and Dudley | 1852 | Sandwell | 4.0 | London Midland Virgin Trains | 280000.0 | 314600.0 |
| Selly Oak | 1876 | Birmingham | 2.0 | London Midland | 1023500.0 | 1113300.0 |
| Shirley | 1908 | Solihull | 4.0 | London Midland | 172700.0 | 164000.0 |
| Small Heath | 1863 | Birmingham | 2.0 | Chiltern Railways London Midland | 37200.0 | 37700.0 |
| Smethwick Rolfe Street | 1852 | Sandwell | 2.0 | London Midland | 113600.0 | 107100.0 |
| Solihull | 1852 | Solihull | 4.0 | Chiltern Railways London Midland | 651800.0 | 662700.0 |
| Spring Road | 1908 | Birmingham | 3.0 | London Midland | 82800.0 | 77000.0 |
| Stechford | 1844 | Birmingham | 3.0 | London Midland | 109200.0 | 119800.0 |
| Stourbridge Junction | 1852 | Dudley | 5.0 | Chiltern Railways London Midland | 444200.0 | 499600.0 |
| Stourbridge Town | 1879 [j ] | Dudley | 5.0 | London Midland | 258700.0 | 278800.0 |
| Sutton Coldfield | 1862 [k ] | Birmingham | 4.0 | London Midland | 578100.0 | 634300.0 |
| Tame Bridge Parkway | 1990 | Sandwell | 4.0 | London Midland Wrexham & Shropshire &#124; | 177800.0 | 189700.0 |
| The Hawthorns | 1931 [l ] | Sandwell | 2.0 | Chiltern Railways London Midland Midland Metro | 145700.0 | 157200.0 |
| Tile Hill | 1864 | Coventry | 5.0 | London Midland | 130700.0 | 142100.0 |
| Tipton | 1852 | Sandwell | 5.0 | London Midland | 124600.0 | 126800.0 |
| Tyseley | 1906 | Birmingham | 2.0 | Chiltern Railways London Midland | 63200.0 | 66500.0 |
| University | 1978 | Birmingham | 2.0 | CrossCountry London Midland | 1190800.0 | 1250900.0 |
| Walsall | 1849 [m ] | Walsall | 4.0 | London Midland | 583300.0 | 587000.0 |
| Whitlocks End | 1936 | Solihull | 4.0 | London Midland | 23500.0 | 26600.0 |
| Widney Manor | 1899 | Solihull | 4.0 | Chiltern Railways London Midland | 119500.0 | 116900.0 |
| Witton | 1876 | Birmingham | 2.0 | London Midland | 77400.0 | 99800.0 |
| Wylde Green | 1862 | Birmingham | 4.0 | London Midland | 223900.0 | 243800.0 |
| Wythall [a ] | 1908 | Bromsgrove | 5.0 | London Midland | 31400.0 | 30300.0 |
Question:
What's the biggest zone?
Answer:
5.0