1965

7.3

2007

8.2

1999

8.1

1996

8.1

1999

7.7

1962

7.3

2020

7.4

1998

7.0

1997

7.1

2013

7.4

2009

5.9

2011

8.5

1991

7.6

2014

8.6

2007

7.5

1998

7.5

2012

8.3

1999

8.6

1969

8.3

2002

7.6