1934

4.1

2005

6.8

1990

7.7

1956

7.6

1966

7.1

1999

7.1

2006

5.8

2001

7.3

2002

6.2

1978

5.9

1960

7.2

1975

6.9

1998

6.5

2006

5.4

1956

6.5

2007

7.6

2007

7.2

2001

6.3

2003

7.2

1989

0.0