2004

5.6

2009

5.5

2007

6.6

1985

5.9

1965

6.6

2007

6.2

2009

4.2

1996

6.9

2001

6.7

1962

7.4

2009

4.8

2008

7.6

2001

6.0

1974

6.2

1956

7.0

2008

4.8

1951

7.0

1986

5.4

1971

7.8

1969

7.8