1986

0.0

1983

4.3

2004

5.6

1987

7.3

2013

6.3

1970

3.0

1999

6.8

1998

6.6

2005

6.8

2006

7.1

1999

7.8

2003

7.2

2001

6.7

2006

6.3

2001

7.4

1991

5.9

1989

7.0

1995

6.5

2003

6.4

1974

5.3