2002

6.3

1998

6.1

1989

6.3

1981

6.9

2003

6.0

2005

3.6

1999

5.5

2008

6.3

2007

5.6

2015

4.8

1982

5.7

2007

7.3

1999

7.5

2009

3.8

2016

7.1

2009

6.5

2013

6.0

1970

6.3

2010

0.0

1973

6.0