2007

5.4

2006

4.3

2010

6.8

2003

7.2

2016

6.0

1996

6.5

1986

6.3

2002

6.6

2016

6.3

1970

4.7

1975

5.0

2009

6.2

2005

4.3

1998

6.6

1997

6.4

2016

6.2

2003

6.1

1985

5.0

1981

7.2

1982

0.0