2017

6.7

2002

6.4

2015

6.4

2006

6.5

2009

5.8

2004

5.6

2009

5.3

1989

6.0

2004

3.8

2008

6.8

1992

4.9

1991

5.6

2011

5.0

1990

5.4

1983

4.0

1998

5.8

2015

4.6

1977

4.1

2006

1.0

2023

0.0