Look under "useful info" for property tax info:
http://www.arubahouses.com/
I will tell you that when we moved here 4 years ago - we didn't get our property tax bills until about 1 year ago and that was 3 separate bills for the previous years.....
I have personally found that Aruba gov't tends to "clump" bills together -
another example - never got an income tax and a AZV bill for all 4 year
until the beginning of this year.
Not sure why - but it's just how it's done