1970

7.5

2005

7.7

2001

7.1

2001

6.0

2001

6.9

2006

6.7

2006

4.9

1996

6.2

2001

6.4

1977

6.5

1982

7.6

1966

7.2

1961

8.0

1957

7.8

2001

7.4

1998

8.2

1955

7.5

1943

8.2

1981

8.1

1969

0.0