1982

7.6

2004

6.7

1994

6.2

1993

6.5

1989

5.1

2016

6.7

1980

5.9

2013

6.2

1967

6.5

2017

6.9

2011

7.1

2013

6.4

2017

6.5

2008

5.8

1993

6.1

2011

6.6

1971

6.2

1967

6.1

1996

6.5

1966

6.1