Washington (CNN Business) The last time the American job market was this strong, astronauts were still going to the moon.

The unemployment rate fell to 3.7% in September, the lowest level since December 1969.

The US economy added 134,000 jobs last month, below expectations and the monthly average for the year. The Labor Department said Hurricane Florence may have impacted jobs results, with leisure and hospitality employment down slightly after trending upwards over the last several months.

The good news is the previous two months' gains were revised up by a combined 87,000 jobs, boosting the monthly average for the past year to a robust 211,400 jobs.

The historically low unemployment rate and relatively weak job growth number might indicate that employers are having an increasingly difficult time adding positions because of the availability of workers. Over the course of this year, recruiters have been more open to job candidates they may before have overlooked, such as those with criminal histories. The employment rate for people with disabilities has also jumped sharply over the past two months.

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