1989

7.4

1925

7.6

1984

8.1

2014

6.7

2007

6.2

2002

6.8

1928

6.4

2010

6.1

1946

7.7

1977

5.2

2009

6.9

2004

5.6

2008

4.9

2006

6.8

1974

4.9

1974

5.7

2004

6.7

2005

6.6

1978

7.5

1962

7.3