2006

6.5

2006

5.6

2008

6.7

1987

7.3

1989

7.0

1992

6.7

1998

6.6

1990

6.1

2007

6.5

2005

5.4

1987

6.5

1974

5.5

1973

3.0

1934

7.5

1963

7.4

1965

6.3

1968

3.7

2007

5.6

1933

8.4

2007

7.6