2015

8.7

1990

7.9

2013

8.0

2006

7.7

2017

7.1

1996

7.4

1985

7.5

1963

7.8

2006

7.4

2000

7.6

2011

7.2

2018

7.6

2000

8.0

2007

7.9

1966

7.6

2003

7.0

2008

8.9

2018

8.0

2003

7.8

1996

7.7