Unable to read cells with % symbol

[NiranjanGodboleMaersk]

I am working on Net core with Open XML. In my excel there is value 100%. I am trying to read as below

GetCellValue method

public static string GetCellValue(SpreadsheetDocument doc, Cell cell)
{
    if (cell.CellValue != null)
    {
        string value = cell.CellValue.InnerText;
        if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
        {
            return doc.WorkbookPart.SharedStringTablePart.SharedStringTable.ChildElements.ElementAt(int.Parse(value)).InnerText;
        }
        else
        {
            return value;
        }
    }
    return string.Empty;
}

GetCell method

public static Cell GetCell(Worksheet worksheet, string columnName, uint rowIndex)
 {
     Row row = worksheet.GetFirstChild<SheetData>().Elements<Row>().FirstOrDefault(r => r.RowIndex == rowIndex);

     if (row != null)
     {
         return row.Elements<Cell>().FirstOrDefault(c => string.Compare(c.CellReference.Value, columnName + rowIndex, true) == 0);
     }
     return null;
 }

I am reading as below.

var data = OpenXmlReader.GetCellValue(spreadsheetDocument, OpenXmlReader.GetCell(workSheet, "E", 11));

The data is coming as 1 whereas actual value in my excel is 100%. I am not sure why this is not properly reading. Can someone please help me? Any help would be appreciated. Thanks