2008

5.9

2005

7.0

1971

6.4

1997

7.6

1995

7.0

1969

7.8

1998

7.1

1988

6.6

2006

5.4

1994

6.5

1989

7.6

2006

6.5

1997

6.7

1996

5.5

2002

5.8

2003

6.4

1988

6.5

1998

5.7

1960

7.6

2002

6.4