1995

7.3

1992

7.0

1989

6.6

2008

6.8

2008

6.2

1984

7.2

2014

6.3

2014

6.4

2003

7.2

1968

7.3

2004

5.6

2017

6.4

2001

5.9

1988

6.3

1975

6.8

2004

5.8

2002

0.0

1992

6.0

1980

4.0

1946

6.0