1990

7.9

1983

7.5

6.3

1984

6.5

2012

5.7

2010

6.4

2021

5.7

2006

5.9

2013

6.1

2009

6.6

2011

6.2

2021

6.2

1995

5.7

2010

5.3

2014

6.0

1998

5.9

2003

6.2

5.6

2005

7.0