1977

3.3

1954

5.0

2001

6.1

2004

9.9

2003

7.3

1958

6.9

1948

6.1

2006

5.4

1990

6.1

1951

7.4

1997

5.4

1989

7.9

1966

7.8

1998

6.3

2000

6.7

1990

6.5

1990

6.1

1967

8.2

1961

7.2

2009

7.5