You can get the data from 1994 to 2008 at the website listed below.
http://www.uscgboating.org/statistic...dent_stats.htm
New Hampshire boating deaths over the period range between 1 and 8 deaths annually with 2 recorded in 2008. Frankly, I don't think the data really tell you much about safety. Factors such as the length of the boating season, per capita accidents, resident vs tourist accidents, fresh or salt water boating and the availability of large bodies of water all effect the number of accidents. Iowa and North Dakota, both land locked with minor lakes, had no deaths in 2008. No surprise there. Florida had at least 50 death every year which is no surprise seeing that their boating season is year round and they have many more people boating.
Over the 1994-2008 period, Vermont had the fewest deaths, Maine the most. I'm not into boating, but I know statistics. A single year's data is rarely the complete story.