2000

5.9

1983

7.3

1977

7.3

1951

7.7

1998

6.9

1958

8.2

1971

6.7

2001

6.2

1998

7.1

2006

8.2

1995

6.4

1998

5.8

1986

7.4

1990

5.8

2005

5.2

1997

6.6

1987

6.8

2009

7.1

1999

6.5

1979

6.5