There were, however, continuing gradual economic improvements, among the most visible of which was the replacement of the traditional thatched blackhouse with accommodation of a more modern design and with the assistance of Highlands and Islands Enterprise many of the islands' populations have begun to increase after decades of decline. The discovery of substantial deposits of North Sea oil in 1965 and the renewables sector have contributed to a degree of economic stability in recent decades. For example, the Arnish yard has had a chequered history but has been a significant employer in both the oil and renewables industries.