1994

6.7

2002

6.6

2004

7.1

2007

7.1

1971

5.5

2006

7.0

1967

5.8

1989

6.7

2009

6.1

1971

7.0

1938

6.6

1973

7.1

2006

4.7

1995

6.6

2008

4.8

2001

6.6

1999

6.5

1999

5.1

2008

6.7

1983

7.4