1955

7.2

1996

6.6

1996

8.0

2000

8.0

2002

7.2

1966

7.3

1985

6.2

2009

6.4

1995

4.0

1979

6.4

2005

2.9

1984

6.5

2009

3.2

1969

3.9

2004

7.1

2016

5.9

2017

7.2

1938

4.2

2009

6.5

1988

5.8