1970

5.5

1947

7.1

2013

0.0

2013

8.1

2004

7.2

2006

0.0

1999

6.8

1988

7.6

2002

4.1

2002

7.1

2003

7.4

1994

7.5

1976

8.1

1970

6.0

1997

6.6

2008

6.8

1984

7.2

2008

5.2

1996

6.9

1983

0.0