1985

2.0

2009

5.1

2017

5.7

2000

6.2

1973

7.4

1965

6.8

1964

6.8

1967

6.7

2000

7.1

1956

6.2

1999

6.5

1973

6.4

1993

6.2

2001

6.6

1997

6.8

1983

6.5

1988

5.2

1977

7.0

1986

6.5

1945

3.7