Although the overall rate of admissions to substance abuse treatment in the U.S. remained stable between 1998 and 2008, at about 770 admissions for every 100,000 persons in the population, a new study shows striking changes and variations in admission rates by region. For example, the rate of admissions for alcohol as the primary drug has declined by 15 percent nationally. However admission rates for alcohol in West North Central states (Ark., Iowa, Kan., Minn., Mo., N.D., Neb. and S.D.) remained the same.