2005

7.0

1991

6.7

2000

6.9

2007

5.3

1961

6.2

2001

6.9

1997

7.0

1966

8.2

1981

7.4

2004

6.2

1965

7.6

2004

7.1

1931

0.0

2000

6.7

1974

3.0

1990

7.7

1942

6.2

1972

6.0

1952

5.7

2014

4.7