2011

Nationwide—intercept; intercept-based mail follow-up;
license frame mail survey

2006

Nationwide -- intercept; intercept-based mail follow-up;
licence frame mail survey

2004

Caribbean -- intercept; phone follow-up; area questions

2003

Southeast -- trip expenditures only

2000

Pacific Coast -- intercept; phone follow-up; RDD

1999

Southeast -- intercept; phone follow-up; RDD

1998

Northeast -- intercept; phone follow-up; RDD