2005

7.8

1981

6.3

1969

6.6

1978

7.0

2006

5.6

1998

4.2

2011

6.1

1942

6.3

1965

7.1

1975

6.1

2006

6.8

2008

7.2

2017

7.3

1985

6.2

1997

5.1

2017

5.5

1936

6.1

2020

5.2

2007

6.5

2002

5.8