1983

6.6

2004

5.6

2000

6.4

2006

0.0

2002

6.0

2015

7.1

2007

7.4

1960

6.1

1977

5.0

1980

7.8

2017

5.8

1997

8.5

1967

6.3

1965

6.3

1970

6.4

1959

7.0

1977

6.1

1964

6.2

2007

6.7

1976

7.0