1994

7.9

1976

7.6

2000

4.0

1980

0.0

1971

7.6

1996

8.5

2007

1.0

2004

6.9

1994

6.8

1978

4.0

2006

7.8

2005

8.1

1999

7.7

1988

6.7

2002

8.1

2005

3.1

1991

6.9

2004

6.0

1975

7.0

1987

7.0