2000

7.1

2002

8.5

2006

6.1

1974

6.9

1985

5.3

2007

6.2

2005

7.5

2005

8.8

1993

6.5

1992

6.8

1973

5.4

2000

6.2

1993

8.0

2004

8.3

1997

8.1

2004

8.6

1966

7.6

1990

8.6

1966

7.5

2003

7.6