1969

3.5

1995

4.1

1934

6.3

1990

8.5

2005

5.4

2004

7.3

2003

5.8

1981

7.3

1991

6.2

2008

5.5

1997

6.5

2002

7.0

1999

6.5

1990

5.9

2004

6.5

2002

7.5

1998

6.8

1997

6.5

1996

7.1

1947

0.0