1997

5.2

1996

4.0

2010

6.0

2007

5.4

1992

7.1

1988

0.0

1984

6.9

1984

4.9

1992

1.7

2013

5.5

1998

6.0

1976

8.7

2005

0.0

1974

8.0

1958

0.0

1991

0.0

2015

6.1

1998

3.4

2006

0.0

2003

6.3

2009

0.0

2006

6.5

1985

4.3

2018

4.5

1997

6.2

2008

5.1