1963

7.0

2014

8.4

1995

8.4

1994

8.7

1977

8.2

1990

7.4

2012

6.6

1983

7.9

2000

8.2

2012

7.2

1992

6.8

2012

7.4

2014

8.0

1989

7.2

1989

7.8

2012

8.2

1991

8.3

1988

8.1

1981

7.1

2005

7.0