1966

0.0

1902

7.9

2005

6.7

1986

7.7

2001

7.8

2004

7.3

2007

6.3

1972

6.4

1992

7.7

1999

6.3

1956

7.3

1955

6.0

2006

6.6

1971

7.4

1984

6.2

1981

6.5

1983

6.1

2001

7.4