Table 2 The number of counties and sample sizes by survey year in the final dataset for persons aged 30 years and older.

1996

2,602

2,768

39,803

58,075

1997

2,698

2,811

43,750

63,420

1998

2,844

2,948

47,680

70,066

1999

2,834

2,959

50,852

75,095

2000

2,907

3,009

58,127

86,386

2001

2,955

3,016

66,065

97,325

2002

2,994

3,050

78,982

119,248

2003

3,007

3,045

84,819

130,777

2004

3,009

3,058

97,198

154,224

2005

3,018

3,064

115,878

186,306

2006

2,747

2,782

111,998

182,346

2007

2,762

2,792

134,325

225,950

2008

2,733

2,765

130,997

218,611

Total

3,140

3,140

1,060,474

1,667,829