1996

7.8

2009

7.5

1995

7.4

1999

6.8

2012

10.0

2018

8.1

1965

7.8

2013

7.3

1985

7.5

2016

6.9

2006

8.2

1983

9.0

1972

4.0

2005

5.2

1964

7.9

1995

6.0

2014

6.3

1987

4.8

1970

5.5

2006

5.0