1993

6.8

2003

5.7

2013

6.6

2014

7.1

2017

7.7

1988

6.1

2011

7.2

1966

6.3

2007

6.4

2003

7.3

2010

5.8

2002

5.2

1999

5.1

2013

6.5

2007

7.3

2005

5.1

2018

6.0

2003

6.4

2004

5.7

6.6