I have a table (matrix) with...
RegistrationYear (2001, 2002...2025)
Brand (MB, VW, ...)
NoOfCarsSold (quantity)
How can I calculate the 'Rolling 5years park' by Brand and Year ?
Rolling 5years park:
Rolling5-Yr2005 = Sum(2001, 2002, 2003, 2004, 2005) by brand
Rolling5-Yr2006 =...