1936

0.0

1989

6.3

1990

5.5

2006

5.5

1987

7.1

1973

0.0

1984

5.6

2006

6.2

2007

5.3

1993

7.0

2006

5.9

1998

6.1

2007

5.7

2007

6.5

2007

5.9

1994

5.2

1958

6.9

2003

7.9

2000

7.1

1998

6.3