1989

6.3

1998

6.1

1999

7.5

2009

4.7

2019

5.9

2003

6.0

1999

5.5

2008

6.3

1981

7.0

2002

6.4

2013

6.0

2014

5.2

1982

5.6

1970

6.3

2007

5.6

2002

6.4

2016

7.1

2009

6.5

2007

0.0

2007

7.4