1990

7.7

2009

4.8

1989

7.1

1989

5.2

2010

6.1

2003

6.3

2001

6.4

1971

6.4

1927

7.8

1980

7.9

1987

6.3

1996

7.6

1963

5.9

1945

7.6

1975

7.3

1961

7.5

1984

8.1

1999

7.5

1982

7.6

2002

6.2