1989

7.0

2004

7.9

2009

6.0

2003

7.1

1999

6.8

1986

7.2

2007

6.4

2014

6.1

2010

7.6

1924

8.1

1979

7.8

1965

7.9

1974

7.9

1996

6.3

1997

5.6

2004

7.3

1999

7.4

1957

8.1

2009

6.0

1995

7.3