1934

4.1

1962

6.0

1990

7.7

1966

7.1

1999

7.1

2006

5.8

2001

6.4

2001

7.3

2002

6.2

1978

5.9

1960

7.2

1975

6.9

1970

7.5

1998

7.2

2005

7.7

2000

6.5

1958

6.6

2004

6.1

2007

7.5

1951

5.0