Year

Mean

Standard deviation

Variance

Minimum

Maximum

2009

387.149

28.710

824.269

372.948

477.398

2010

381.162

4.386

19.239

372.887

387.056

2011

382.833

4.778

22.826

372.579

388.765

2012

386.839

4.639

21.524

380.198

398.513

2013

388.241

4.004

16.035

382.363

393.243