2006

6.9

1994

7.4

2009

6.0

2004

7.2

1991

8.3

2009

6.0

1996

5.4

1993

8.1

1987

6.5

1967

7.6

1999

6.0

2007

7.1

2003

6.4

1998

6.2

1966

6.9

1983

6.1

2017

6.5

2015

5.9

1966

7.6

1933

6.9