Load the following script:

CrossTable(Country, Sales)
LOAD * INLINE [
    Date, USA, UK, Japan, Germany
    2013-01-01, 123, 100, 80, 40
    2013-02-01, 134, 111, 75, 50
    2013-03-01, 155,  95, 70, 60
    2013-04-01, 165,  85, 88, 50
    2013-05-01, 154, 125, 90, 70
    2013-06-01, 133, 110, 75, 99
];

These steps will create a line chart with labels on each line instead of a legend:

The Dual function will only return a text value when the date matches the maximum date. Otherwise, it is blank. So, when we enable the Values on Data Points option, it only displays a value for the last data point.

It is critical that you don't set a number format for the expression. The Expression Default option means that it will use the text from the dual.

Dual is a really useful function to allow us to define exactly what will be displayed on labels such as this. It is also really useful for sorting text values in a specific order.