1969

3.0

2005

6.0

1996

4.8

1985

7.2

2006

6.2

2005

5.7

2018

6.3

1992

5.3

2004

5.1

1978

7.4

1994

6.0

2007

6.0

1987

7.3

2002

4.8

2008

4.8

1989

6.8

1993

7.0

1994

5.1

1991

7.1

1957

5.2