2009

2.7

2004

3.5

2015

4.9

2009

5.5

2003

5.3

2002

4.2

1995

1.0

2005

6.2

2015

4.1

1975

0.0

1995

5.3

2002

6.0

1963

7.5

2013

0.0

2005

6.3

1997

6.5

2006

6.6

2008

5.7

1989

6.6

2005

6.2