If you are going to buy a home near the ocean in southern US or the Caribbean, Sosua is, based on the record, as safe or safer than any place else. If you look at the chart that A. Hidalgo linked to, do a search for all storms in all years, you get a very impressive number. However, if you look at the lines depicting the storm tracks, you will see that most were in the ocean when they passed by Sosua and that the rest had crossed the country from the south before getting to Sosua.
Additionally, if you look at all the data included with the long list of storms, you will see that most were tropical storms or tropical depressions and that wind speeds of 30-50 miles were common.
Yes, there are hurricanes on the list, but what that webpage does not tell you is what the wind speed was when it passed by Sosua. For example, storms crossing the country have lost much of their punch by the time they get to Sosua.
Sosua is not on the route normally taken by hurricanes. Most that leave the Caribbean have started to curve north before they get to Sosua. We may get winds of 35-45 miles, but these are not huricane force winds and are easily handled by the type of construction common here. Sure, if you have zinc sheets on your roof, or palm branches, you may have trouble. But I doubt very much that any house or apartment that you are looking at has such a roof.