1981

5.2

2001

6.2

2013

0.0

1988

0.0

1997

5.4

1981

4.4

1999

0.0

1997

1.0

2002

5.2

2015

0.0

2004

6.6

1997

5.5

2007

6.4

1997

0.0

2006

3.5

1995

0.0

1971

6.4

2001

6.7

2002

6.0

1970

6.1

1992

5.7

2001

6.2

1958

6.7

1994

5.5