1969

0.0

2000

7.2

2006

7.9

2006

0.7

2002

8.5

1985

2.0

1996

9.2

2006

6.1

1984

5.9

2003

4.8

1976

7.0

1989

7.2

2002

6.3

1990

7.6

1973

7.0

1987

0.0

1992

10.0

2003

8.5

1993

6.5

1973

8.0