Well it's taken me two years to come up with a total number of figures in my collection from 1978-present. I have 1530 figures +/- 5% error. This makes for a grand retail total of $9104.41 spent between 1978 to today in figures. Over a course of 26 years ((2013-1995) + (1984-1978) = 26) would be $350.17 per year.
All of them are loose and I include duplicates in this number. I've included in my spreadsheet the quantity, type, source, year, collection, retail price, assortment number, UPC number and list of accessories for everything. I've also recorded the total number of ships and playset too that I could calculate if anyone is interested. If you like I can send you my spreadsheet. It might help you catalog your collection. All of the extra data points came from Rebelscum's photo gallery.