2005

7.0

2004

6.1

1985

5.7

1993

6.6

1981

6.3

1996

6.7

1987

7.2

2005

5.6

2006

6.7

2005

5.8

1991

6.9

1986

7.1

1994

6.6

1996

6.5

1974

6.0

2014

7.0

1999

7.9

1973

0.0

2008

5.5

2008

6.0