1966

5.8

1993

6.3

1991

6.7

2002

6.2

1997

6.8

2005

6.7

2006

6.8

2005

7.0

1987

7.1

1992

6.8

2005

6.2

2007

6.5

2008

6.5

1965

7.4

2014

5.4

1958

6.6

1997

7.3

2012

4.3

2017

4.3

1985

1.0