2010

6.5

2007

6.3

1986

6.9

2003

6.8

1981

6.4

2004

6.6

1999

7.0

2005

6.0

2002

7.1

1983

7.2

2016

7.2

1970

7.3

2017

7.6

2006

5.9

1998

4.8

2009

4.6

2014

5.9

2009

6.1

1999

6.8

1989

6.2