Petroleum Safety Authority Norway published data for 2013 for personal injuries on the Norwegian continental shelf for both mobile and permanently-placed facilities.
For mobile platforms, the safety authority said injuries reported per million work hours were down about half of their high-water mark of 13.9 reported in 2007, but 15 percent higher than their lowest level reported in 2010.
For permanent installations, the number of injuries reported per million work hours showed a steady decline of about 40 percent from 2005.
The safety authority provided no data to show a relationship between production levels for oil and gas and the number of injuries reported.
Norway is the largest oil producer and the third-largest natural gas producer in Europe. Last year, most of its oil went to the United Kingdom and the Netherlands and it supplied members of the European Union with about 21 percent of their gas needs last year, just behind Russia.