1994

3.6

1999

7.0

1949

7.9

2006

6.3

1964

5.9

1976

7.6

2000

6.1

2006

6.7

1962

7.5

2013

4.8

1963

7.1

1977

6.8

1981

6.5

1987

6.5

1995

6.9

1979

4.8

2004

6.6

1969

7.8

2003

6.3

2006

7.3