Here is a revised color palette with more muted colors, making it easier on the eyes while still allowing for differentiation between the years in Excel.

json
{
  "palette_name": "Muted Years in Excel",
  "colors": [
    {
      "name": "Year 1",
      "hex_code": "
                            
                            #D5B5A0
                        "
    },
    {
      "name": "Year 2",
      "hex_code": "
                            
                            #A8D5BA
                        "
    },
    {
      "name": "Year 3",
      "hex_code": "
                            
                            #A0C4E1
                        "
    },
    {
      "name": "Year 4",
      "hex_code": "
                            
                            #E0C68B
                        "
    },
    {
      "name": "Year 5",
      "hex_code": "
                            
                            #C39BD3
                        "
    },
    {
      "name": "Year 6",
      "hex_code": "
                            
                            #EAB8A1
                        "
    },
    {
      "name": "Year 7",
      "hex_code": "
                            
                            #A8E6CF
                        "
    },
    {
      "name": "Year 8",
      "hex_code": "
                            
                            #B2C2E8
                        "
    },
    {
      "name": "Year 9",
      "hex_code": "
                            
                            #D5B5D3
                        "
    },
    {
      "name": "Year 10",
      "hex_code": "
                            
                            #A1D3D1
                        "
    }
  ]
}

This muted palette should be easier to work with while still providing a clear distinction between each year. Would you like to make any further adjustments or do you have any specific colors in mind?