1953

6.5

2000

6.6

1964

6.8

2008

7.2

2002

7.6

2002

7.5

1994

7.9

2000

6.3

2003

7.8

1999

7.0

2005

7.8

2005

7.0

1937

7.9

1998

6.8

1962

7.3

1958

7.5

1983

7.3

2004

6.5

2017

8.0

1983

6.0