1969

0.0

1985

5.7

1970

4.7

1982

5.9

1958

6.1

1976

4.9

1969

4.8

2004

3.6

1985

6.8

1995

8.4

1997

6.6

1999

6.3

2002

6.0

1996

7.6

1974

7.9

1931

8.1

2004

6.5

1951

7.7

1958

7.4

1994

7.0