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:
| Series number | Episode number | Date of first broadcast | Total viewers | Series average |
| --- | --- | --- | --- | --- |
| Series 1 | 1.0 | 27 September 2007 | 1997000.0 | 1242125.0 |
| Series 1 | 2.0 | 4 October 2007 | 1475000.0 | 1242125.0 |
| Series 1 | 3.0 | 11 October 2007 | 1098000.0 | 1242125.0 |
| Series 1 | 4.0 | 18 October 2007 | 1108000.0 | 1242125.0 |
| Series 1 | 5.0 | 25 October 2007 | 1077000.0 | 1242125.0 |
| Series 1 | 6.0 | 1 November 2007 | 1003000.0 | 1242125.0 |
| Series 1 | 7.0 | 8 November 2007 | 1194000.0 | 1242125.0 |
| Series 1 | 8.0 | 15 November 2007 | 985000.0 | 1242125.0 |
| Series 2 | 1.0 | 11 September 2008 | 1074000.0 | 975500.0 |
| Series 2 | 2.0 | 11 September 2008 | 1044000.0 | 975500.0 |
| Series 2 | 3.0 | 18 September 2008 | 1081000.0 | 975500.0 |
| Series 2 | 4.0 | 25 September 2008 | 879000.0 | 975500.0 |
| Series 2 | 5.0 | 2 October 2008 | 896000.0 | 975500.0 |
| Series 2 | 6.0 | 9 October 2008 | 969000.0 | 975500.0 |
| Series 2 | 7.0 | 16 October 2008 | 959000.0 | 975500.0 |
| Series 2 | 8.0 | 23 October 2008 | 902000.0 | 975500.0 |
| Series 3 | 1.0 | 28 January 2010 | 924000.0 | 837125.0 |
| Series 3 | 2.0 | 28 January 2010 | 875000.0 | 837125.0 |
| Series 3 | 3.0 | 4 February 2010 | 731000.0 | 837125.0 |
| Series 3 | 4.0 | 11 February 2010 | 805000.0 | 837125.0 |
| Series 3 | 5.0 | 18 February 2010 | 941000.0 | 837125.0 |
| Series 3 | 6.0 | 25 February 2010 | 889000.0 | 837125.0 |
| Series 3 | 7.0 | 4 March 2010 | 806000.0 | 837125.0 |
| Series 3 | 8.0 | 11 March 2010 | 726000.0 | 837125.0 |
| Series 4 | 1.0 | 1 February 2011 | 829000.0 | 649000.0 |
| Series 4 | 2.0 | 8 February 2011 | 665000.0 | 649000.0 |
| Series 4 | 3.0 | 15 February 2011 | 614000.0 | 649000.0 |
| Series 4 | 4.0 | 22 February 2011 | 572000.0 | 649000.0 |
| Series 4 | 5.0 | 1 March 2011 | 661000.0 | 649000.0 |
| Series 4 | 6.0 | 8 March 2011 | 674000.0 | 649000.0 |
| Series 4 | 7.0 | 15 March 2011 | 582000.0 | 649000.0 |
Question:
what is  the series number where the date of first broadcast is 16 october 2008?
Answer:
Series 2