2015

8.7

2009

7.0

2001

6.6

1995

6.4

2003

8.2

1985

7.4

1973

8.1

2008

7.6

2002

7.5

2015

7.5

2001

7.8

2009

6.4

2006

7.8

2004

8.6

1963

7.9

1973

7.0

1986

8.3

2016

8.6

2008

7.5

2017

8.6