1996

6.2

2006

5.8

1990

7.3

1967

6.9

2016

5.2

1969

5.7

2009

5.7

1938

3.0

2018

2.0

1994

6.0

1965

7.1

2006

6.2

1993

6.4

1977

5.9

1982

7.3

1974

5.0

1989

7.3

2008

6.1

1995

6.2

2007

7.5