2005

6.8

1974

8.6

2006

5.9

1995

7.0

1960

8.2

2017

5.7

2006

4.9

2006

6.2

1997

7.6

1981

7.5

1998

6.5

2007

7.2

1993

6.0

1976

4.2

1991

6.2

2017

5.2

2014

6.8

2001

7.3

2008

6.9

1989

6.2