0.0

2008

7.4

2002

6.6

2004

6.4

2005

6.7

1970

6.1

1971

6.4

1972

6.2

1973

5.7

1966

7.1

1962

7.4

2000

6.9

2004

6.5

2004

6.0

1988

7.3

2000

6.6

2007

6.3

2015

6.5

2007

6.0

1975

6.3