1985

6.2

2005

6.6

2002

6.2

2013

8.0

1994

6.5

2001

7.5

1944

5.8

2001

6.1

1984

5.0

1984

6.3

1977

6.8

1951

7.2

1977

6.1

1985

7.0

2002

7.0

1998

6.4

2001

5.2

2003

6.4

1987

6.7

2000

5.2