2005

6.8

1997

6.8

1995

6.5

1984

6.0

2018

4.2

2016

3.9

1970

5.5

1969

6.9

2007

7.6

1987

6.0

1972

6.2

2005

5.2

2006

5.4

2005

6.9

2006

4.3

1996

5.5

2000

6.1

1988

6.7

2008

6.1

1982

5.2