1955

7.3

1956

7.1

1957

7.2

2011

7.0

1965

5.0

0.0

2014

7.8

2006

6.2

2009

4.6

1995

6.1

2009

6.9

1996

6.2

2008

7.0

2002

7.8

1991

3.0

2008

7.6

1961

7.3

1974

6.0

1995

7.4

2015

4.0