Ignore a Slicer?

I have a simple table visual showing a list of transactions, each row of which has a date and a value (a dollar amount). I have a slicer which allows the user to select a date, and the table correctly shows only the transactions for that date.

I now have a requirement to show the Year To Date figures - so whatever date the user chooses in the slicer, he'll see a separate display of the total of the transactions this year up to and including the chosen date.

How can I calculate the total of the transactions up to and including the selected date? I created a simple calculation:

This Year NB To Date = sumx(filter(Tx,
                                   Tx[Created On] <= [Date Selected] && Tx[Created On] >= DATE(2018,1,1)),
                            Tx[Value])

Note that the "[Date Selected]" item is just a variable holding the date selected in the slicer.

But the slicer stops that calculation from seeing all the dates - it just gives the total for the date selected in the slicer, not for the whole year up to and including that point.