2017

6.7

2009

5.8

2015

6.4

2002

6.3

2006

6.5

2004

5.6

1992

4.9

2009

5.3

2008

6.8

1983

4.0

1977

4.1

1998

5.8

1990

5.4

1989

6.0

2004

3.8

2011

5.0

1991

5.6

2015

4.6

2006

1.0

2023

0.0