2001

8.3

1983

8.0

2007

7.9

2004

7.1

2005

8.3

2010

8.2

2006

7.8

1990

8.0

2001

8.5

2015

7.5

2005

7.2

1981

7.9

1959

8.4

2002

8.1

2017

7.2

2010

7.8

2003

7.9

1994

8.1

1986

8.1

2011

7.5