1973

5.2

1983

7.1

2013

2.7

1991

7.0

1980

2.0

1975

0.0

2016

5.6

2009

5.0

1996

3.7

1972

6.7

1975

7.2

1970

6.0

1972

6.2

1978

7.1

1960

7.1

2007

0.0

2009

6.0

1978

0.0

1974

5.9

1990

5.7