2005

5.8

2008

4.8

2001

7.3

1997

6.8

2005

6.7

2005

6.8

1991

5.9

1989

6.9

1995

6.4

2003

6.5

1990

6.8

1972

6.9

2005

5.5

2014

6.3

2009

5.8

1999

7.4

2003

5.9

1988

5.1

1983

3.0

1987

4.7