1961

7.6

1974

7.8

2016

6.3

2006

6.5

2009

5.9

2002

5.9

1992

4.5

0.0

2013

7.1

1981

6.1

1987

5.6

1950

8.0

2001

7.3

2004

6.1

1976

7.0

1983

5.0

2005

6.0

1981

4.2

2001

6.9

2013

4.3