2005

5.9

1983

6.2

1980

6.3

1978

8.0

1989

2.5

1969

7.1

1984

6.6

2017

5.3

2014

6.1

2002

5.6

1991

6.5

2000

4.2

2005

6.2

1993

6.9

2006

6.1

2006

7.1

1960

5.4

2004

6.4

2007

7.6

2016

4.6