2005

6.7

1998

6.9

2005

7.2

2006

7.6

1995

6.7

2007

7.4

2006

7.1

2000

6.7

1997

6.5

1963

6.3

1953

6.3

1935

7.3

1964

7.2

2007

5.1

2001

5.9

1927

7.1

1999

5.8

1996

6.7

2002

6.9

1962

5.6