2006

1.5

2015

5.9

2005

7.8

1990

7.0

1967

6.6

1969

6.6

1977

6.8

2005

4.5

2003

6.3

1984

5.9

2007

6.1

2003

6.1

2003

5.8

2005

5.9

2014

5.6

2002

3.7

1991

6.1

1987

6.8

2006

5.7

2001

6.5