2008

6.1

2002

6.1

1991

6.1

2007

6.1

1999

6.6

1985

7.7

2000

5.5

2007

7.1

2004

6.8

2007

7.3

2004

6.6

2001

7.0

2004

6.0

2017

6.3

1993

7.3

2006

6.8

2017

0.0

1976

6.6

2016

6.1

1979

6.3