2006

6.5

2007

7.2

2005

5.9

1995

6.3

2008

6.2

1979

6.8

1985

6.2

1996

6.8

1997

5.6

2014

5.4

1962

6.7

1967

6.9

1985

5.4

1930

3.5

2005

6.2

1975

7.3

1986

4.7

1998

6.9

1986

7.1

1978

6.2