The number of unemployed workers with construction experience dropped to the lowest total for September since 2000, as hiring continued to slow despite robust demand for construction, the Associated General Contractors of America said today. Association officials cautioned that the hiring slowdown most likely reflects a lack of available workers that could lead to project delays unless more students and workers join the construction sector. Construction employment totaled 6.4 million in September, the most since February 2009, but the total rose by only 8,000 in September and by 205,000, or 3.3 percent, over the past year, according to a release. The number of unemployed job seekers in September who last worked in construction totaled 479,000, the lowest figure for September since 2000. For the year ending in August, construction spending increased nearly 14 percent, reaching a nine-year high.