2003

3.2

1993

5.3

1980

6.5

1989

6.8

1986

7.6

2005

6.3

1993

7.3

1995

6.3

2003

6.8

2004

7.2

1996

7.3

2006

6.5

2017

7.5

1992

6.5

1993

7.5

1988

6.5

2001

5.8

1977

5.7

2004

6.8

1992

6.6