1987

0.0

1989

4.5

2001

8.2

1967

7.4

1989

7.9

1999

7.1

2003

7.2

2007

6.2

1999

5.4

2002

7.1

1995

7.7

2001

0.0

2007

7.1

1983

7.4

1994

7.3

1979

7.2

2005

7.7

2003

8.1

2006

9.0

1990

7.0