Chart not updating when new data is added

I have created a sheet with numbers in them for inputting on different days as you can see from my spreadsheet chart data has been inputted after the 20th Jan 2016 but does not show on the chart, all data seem to be in number format and not text, can you help

For some reason, some of the dates in column A are year 1900. Your chart is formatted so that the earliest date is 1 Jan 2016, so dates before that will not show up. I suspect that if you make sure that all of your dates are for 2016, they should show up correctly.