1969

0.0

1985

5.4

1982

5.8

1970

4.3

1958

5.9

1977

4.8

2004

3.4

1969

4.9

1985

5.8

1964

4.1

2003

8.0

2005

7.2

1997

6.7

2005

6.9

2006

6.0

1984

7.2

1959

7.8

1987

6.5

1998

8.1

1994

8.3