public Report(string fileName)
{
this.fileName = fileName;
workbook = new XSSFWorkbook();
listSumRtkGts = new List<int>();
cellStyles = new CellStyles(workbook);
styleDouble = cellStyles.Double();
styleDoubleBold = cellStyles.DoubleBold();
styleTable = cellStyles.Table();
styleCaption = cellStyles.Caption();
styleDoubleGts = cellStyles.DoubleGts();
styleGts = cellStyles.Gts();
styleDoubleRtk = cellStyles.DoubleRtk();
styleRtk = cellStyles.Rtk();
}