1997

6.5

1985

6.5

2003

6.2

2010

5.9

2005

0.0

2017

6.3

1999

6.4

1998

7.1

1981

5.4

2006

4.3

2016

5.0

2013

5.5

1966

5.0

1984

6.3

1988

0.0

2000

3.6

1981

5.9

2016

8.5

2006

7.0

1989

6.8