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:
| Leader | Party | Leader's Seat | Number of Seats | Leader since |
| --- | --- | --- | --- | --- |
| Peter Robinson | Democratic Unionist Party | Belfast East | 38.0 | 31 May 2008 |
| Raymond McCartney | Sinn Féin | Foyle | 29.0 | 2011 |
| Tom Elliott | Ulster Unionist Party | Fermanagh and South Tyrone | 16.0 | 22 September 2010 |
| Margaret Ritchie | Social Democratic and Labour Party | South Down | 14.0 | 7 February 2010 |
| David Ford | Alliance Party of Northern Ireland | South Antrim | 8.0 | 2001 |
| Steven Agnew | Green Party in Northern Ireland | North Down | 1.0 | 2010 |
| Jim Allister | Traditional Unionist Voice | North Antrim | 1.0 | 2007 |
Question:
Which leader has been a leader since 2007?
Answer:
Jim Allister