September was a good month for construction unemployment numbers, according to analysis by Dr. Bernard Markstein of the Associated Builders and Contractors (ABC).

The construction employment rates, not seasonally adjusted (NSA), for the U.S. and 48 states were down for the month on a year-over-year basis. For the first three quarters of the year, construction added 121,000 seasonally adjusted (SA) jobs. NSA jobs, meanwhile, increased by 199,000 from September 2014 to September 2015.

Over the last 15 years, the national NSA construction unemployment rate has decreased in September from the previous month approximately half of the time, according to ABC. This September, the rate fell 0.6 percent, and the estimated NSA construction unemployment rate fell for 34 states from August and remained the same in three states. September marked the fourth month in a row that all state construction unemployment rates were under 10 percent.

The five states with the lowest construction unemployment rates were North Dakota, South Dakota*, Wyoming, Utah and Maryland* (*unemployment rate is for construction, mining and logging combined). The top three states—North Dakota, South Dakota and Wyoming—were also among the top five in August.

The five states with the highest construction unemployment rates (from highest to lowest) were Rhode Island, Connecticut and Georgia (tie), West Virginia and Mississippi. Three of the five states with the highest estimated construction unemployment rates in September—Mississippi, Rhode Island and West Virginia—were among the five highest in August.