1975

6.7

1982

6.1

2005

5.1

2009

5.1

2008

5.7

1972

6.1

1943

7.5

1998

7.2

1974

6.6

1981

6.4

1973

6.7

1999

6.3

1975

7.0

1996

6.2

2006

7.8

2000

5.0

2014

5.7

2017

10.0

2011

6.0

1958

7.5