1955

7.3

1956

7.1

1957

7.2

2006

6.7

2005

7.7

1960

6.7

2017

4.8

1985

7.2

2003

7.6

2008

6.8

2003

7.2

1968

9.0

1961

6.0

1978

0.0

1991

3.0

1996

6.2

1977

5.1

1975

8.0

2006

6.9

1959

7.9