Hi
try this
create a new variable(measure)
current year = Max([Fiscal year])In ([Revenue])
last 8 =FormatNumber((ToNumber(Max([current year]))-1);"##")
fis = [Fiscal year] Where (([Fiscal year]>=[last 8] )And ([Fiscal year] <=[current year]))In ([Revenue])
Note you have to use this formula
last 8 =FormatNumber((ToNumber(Max([current year]))-8);"##")
and apply filter FIS is not null