2007

5.4

1999

7.1

2000

4.4

2000

7.4

1991

7.6

1999

6.2

2003

6.1

1985

7.5

2003

5.9

2001

6.6

1994

6.6

1981

7.2

1935

3.5

1999

6.1

1948

8.2

1945

8.1

1999

7.3

2016

6.1

2001

7.1

1991

6.9