1979

5.5

2013

8.0

1998

5.4

1993

6.5

2003

5.7

1976

6.6

1998

7.4

1983

6.4

1984

7.4

2008

3.5

1982

7.5

1997

3.0

1972

7.9

1986

7.2

2004

5.3

1986

5.5

1999

6.0

1997

3.3

2003

7.8

1997

5.0

2000

7.6

2010

7.4

2013

7.4

2005

7.0

1998

4.5

1981

7.5

1977

7.2

2011

4.0

2007

3.7

1982

7.5

2011

6.1

1996

5.0

2006

5.3

1983

6.8