what is the average windspeed brussels had?
0.50
col : year | time | windspeed | city | date |  row 1 : 2000 | 11.45 | −2.3 | kingston | 13 march | the progression of powell's 100 m seasons' best times row 2 : 2001 | 10.50 | 0.40 | kingston | 22 june | the progression of powell's 100 m seasons' best times row 3 : 2002 | 10.12 | 1.30 | rovereto | 28 august | the progression of powell's 100 m seasons' best times row 4 : 2003 | 10.02 | 0.80 | brussels | 5 september | the progression of powell's 100 m seasons' best times row 5 : 2004 | 9.87 | 0.20 | brussels | 3 september | the progression of powell's 100 m seasons' best times row 6 : 2005 | 9.77 | 1.60 | athens | 14 june | the progression of powell's 100 m seasons' best times row 7 : 2006 | 9.77 | 1.00 | zürich | 15 august | the progression of powell's 100 m seasons' best times row 8 : 2007 | 9.74 | 1.70 | rieti | 9 september | the progression of powell's 100 m seasons' best times row 9 : 2008 | 9.72 | 0.20 | lausanne | 2 september | the progression of powell's 100 m seasons' best times row 10 : 2009 | 9.82 | 1.40 | szczecin | 15 september | the progression of powell's 100 m seasons' best times row 11 : 2010 | 9.82 | 0.60 | rome | 10 june | the progression of powell's 100 m seasons' best times row 12 : 2011 | 9.78 | 1.00 | lausanne | 30 june | the progression of powell's 100 m seasons' best times
what is the average windspeed brussels had?
Year Time Windspeed City Date
2000 11.45 −2.3 Kingston 13 March The progression of Powell's 100 m seasons' best times
2001 10.50 0.40 Kingston 22 June The progression of Powell's 100 m seasons' best times
2002 10.12 1.30 Rovereto 28 August The progression of Powell's 100 m seasons' best times
2003 10.02 0.80 Brussels 5 September The progression of Powell's 100 m seasons' best times
2004 9.87 0.20 Brussels 3 September The progression of Powell's 100 m seasons' best times
2005 9.77 1.60 Athens 14 June The progression of Powell's 100 m seasons' best times
2006 9.77 1.00 Zürich 15 August The progression of Powell's 100 m seasons' best times
2007 9.74 1.70 Rieti 9 September The progression of Powell's 100 m seasons' best times
2008 9.72 0.20 Lausanne 2 September The progression of Powell's 100 m seasons' best times
2009 9.82 1.40 Szczecin 15 September The progression of Powell's 100 m seasons' best times
2010 9.82 0.60 Rome 10 June The progression of Powell's 100 m seasons' best times
2011 9.78 1.00 Lausanne 30 June The progression of Powell's 100 m seasons' best times
0.50