2014

4.6

1974

5.9

1972

6.2

2013

5.7

1981

7.4

2011

5.8

2003

6.8

2014

5.4

1985

5.2

2008

4.0

1989

5.6

1988

5.4

2004

5.6

1996

6.3

2001

5.6

1961

6.5

1973

5.1

1977

6.0

1970

6.1

2004

6.3