For those who tried this chart during the first hours it was available, you might have been put off by the fact that the decimal separator was a comma instead of a period. Since I have developed this spreadsheet in Québec, where we speak French and use commas as decimal separators, the number format was different. I thought that Google Sheets was adapting the number format to the user country but it's not.
I now have made the change and you will be able to use periods instead of commas.