1969

3.5

2005

7.0

1998

6.9

1972

7.1

2004

7.3

2007

6.4

2005

7.1

1997

7.1

1999

6.9

1975

7.7

1987

4.1

1990

7.8

2003

7.8

1982

7.5

1996

6.9

2003

7.1

2003

6.7

1997

7.2

1922

0.0

1924

0.0