2006

6.6

1984

7.1

1989

5.4

1983

5.5

1966

6.1

1970

6.4

2013

8.3

2011

6.1

1992

7.1

2019

7.7

2008

6.2

1978

5.9

2008

8.1

1989

6.5

1993

6.5

1991

7.0

1990

5.9

2015

6.3

2014

7.1