2007

5.8

2014

1.5

1976

6.5

1971

7.2

1999

7.1

1982

8.1

1981

7.1

2006

8.2

2002

5.9

1999

6.8

2001

6.2

2000

6.5

1960

7.3

2002

6.3

1966

6.7

1991

7.3

1995

7.3

1968

7.1

1978

7.5

2004

7.1