Year

Incumbents Seeking Re-Election

Percent Incumbents Running

Number of Incumbents Lost Primary

Number of Incumbents Lost in General

Total Number of Incumbents Defeated

Percentage of Incumbents Who Lost

1976

169

83%

5

10

15

 9%

1978

183

90%

10

13

23

13%

1980

170

84%

12

5

17

10%

1982

179

88%

8

6

14

 8%

1984

187

92%

4

0

4

2%

1986

194

96%

2

0

2

 1%

1988

181

89%

1

3

4

 2%

1990

189

93%

2

15

17

 9%

1992

174

86%

4

3

7

 4%

1994

184

91%

2

2

4

 2%

1996

190

94%

0

2

2

 1%

1998

190

94%

2

0

2

 1%

2000

188

92%

2

2

4

 2%

2002

186

92%

4

3

7

 4%

2004

193

94%

1

2

3

 1%

2006

173

85%

15

7

22

13%

2008

179

88%

-

-

-

-