Suppose you want to provide a user with a list box in which the choices are the current year, up to 10 prior years and up to 10 future years.
In other words, the choices in the list box should be 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 1999...