2007

7.9

2008

7.6

2018

8.1

2010

8.0

2009

7.5

1966

7.3

1996

7.5

1991

7.5

1998

6.8

2003

7.2

1993

8.4

2016

6.5

1990

6.9

1984

7.5

2008

6.2

2010

8.1

2014

8.3

2015

7.3

2014

6.7

1969

8.2