1994

5.8

2003

6.1

1982

5.9

1987

5.6

1976

3.8

2013

5.3

2004

5.3

2004

7.2

2006

7.0

2003

6.0

2005

5.9

2008

0.0

2002

7.1

1979

5.3

1971

3.3

2013

3.6

2016

5.9

1976

5.7

1930

6.8

1997

6.8