Set analysis - year -1 for all selections

[#1]

Hi All,

I'm trying to reach the following result with set analyais:

For each year year chosen (not max year) show data for previous year. So:

If 2015 is chosen - show data for 2014.

If 2015 and 2016 are chosen show data for 2014 and and 2015.

If none is selected (so all the years are chosen by default) - show data for year-1 of all the years.

How can that be done?

(The needed solution is more complex but that would be a good start).

Thanks!