1993

7.4

2013

5.8

2005

7.3

2000

7.1

2012

6.9

2011

6.2

1999

6.0

2000

7.4

2011

5.2

1994

6.6

1979

6.7

1958

8.2

2014

6.9

2006

5.0

2012

7.0

2015

7.6

2010

7.2

2018

6.4

1991

6.6

2009

7.5