1995

7.9

2003

8.3

1982

7.9

1994

8.3

1976

8.1

2008

8.5

1997

7.4

2005

7.1

2002

5.3

2001

7.5

1999

6.8

1997

7.8

1997

6.8

1993

5.0

1967

7.8

2016

0.0

2014

6.8

2007

7.3

1992

5.7

2004

6.9