2005

6.9

1998

6.8

1978

4.3

1993

5.2

1988

6.9

2017

3.9

1964

6.6

2014

1.8

2008

5.6

1998

6.3

2007

5.2

1999

5.5

2014

4.5

2006

5.1

2009

6.2

2016

0.0

1997

6.0

1984

6.2

2008

3.3

2018

6.0