2005

6.5

1996

6.4

1987

7.5

1997

6.8

2007

6.8

1982

8.1

2015

5.8

1979

8.2

2004

5.9

1982

7.5

1996

6.9

1997

7.2

2002

6.4

2001

7.0

1986

8.0

1981

6.4

1995

6.0

2003

7.8

1997

3.5

1998

6.6