2005

6.5

1998

6.8

1970

3.7

2006

5.9

1978

5.1

1997

4.6

1955

6.0

2003

5.8

2004

6.0

1997

5.9

1971

7.0

1958

7.6

1965

5.7

2009

5.8

1995

7.8

1977

6.0

1985

6.6

2006

5.5

2019

7.2

2019

6.4