Workers in the U.S. resigned from a record 4.4 million jobs in September. Many Americans are leaving roles for better working conditions and pay amid a historically fast economic recovery.

The wave of resignations hasn’t been uniform across the country, though. States in the West, including Hawaii, Montana, Utah and Oregon, saw the largest growth in quits in September, according to the Labor Department. Eighteen states broke or tied their records for quits levels in September.

Fast-rising quits add to evidence that the labor market is historically tight. Employers are struggling to find workers to fill a multitude of job postings as demand picks up. There are about 10 job openings for every seven job seekers.