1993

7.4

1998

8.1

2003

7.1

2002

6.1

2017

6.7

2009

7.5

2015

6.9

1971

7.3

1983

6.0

1972

7.3

1998

0.0

1965

6.0

1981

4.0

1997

6.8

1988

6.6

1983

7.0

0.0

2003

7.0

2006

6.7

1999

5.3