2005

6.7

1972

6.9

1973

7.8

2007

6.6

2004

5.6

2007

6.8

1967

7.5

1977

7.1

2006

7.1

2005

6.6

2003

6.6

1990

6.7

1983

5.9

2006

6.7

2006

7.1

2001

6.7

1998

6.5

1977

6.3

1969

6.9

2005

6.4