2005

6.8

2003

6.8

2007

5.3

2006

6.6

2016

7.3

2018

6.1

2003

6.3

2002

6.3

2004

7.2

2006

6.0

2007

6.4

2002

5.3

1987

6.9

2003

7.2

2007

4.8

1996

6.3

1979

5.2

1986

0.0

1992

6.8

1998

7.5