2015

8.7

2010

6.7

1997

7.4

2001

6.5

1999

7.4

1963

7.9

2006

6.9

1998

7.0

1994

8.4

1999

7.5

2003

7.9

2013

8.2

1980

7.3

1999

7.1

2012

6.8

1997

8.3

2015

8.3

1989

8.0

1989

8.2

1968

8.0