1978

6.9

2007

7.7

2007

6.3

1966

7.2

2017

6.1

1998

5.3

1996

7.0

1998

6.0

1992

6.3

2002

6.0

2007

6.2

1977

4.4

2001

7.1

1994

6.0

2004

4.8

2003

7.2

1968

4.4

1989

6.1

2001

5.7

2009

6.4