2008

8.9

1999

8.7

1995

7.8

1993

7.9

1987

8.4

2011

8.3

1999

7.4

2006

8.6

2018

8.3

2006

8.2

2011

6.4

2001

7.8

2015

7.5

2007

8.1

1966

8.0

1994

8.4

2011

7.6

1975

8.3

2016

8.0

2014

8.3