2014

6.6

2006

5.8

2004

6.7

1991

6.2

1990

6.7

1993

5.5

2023

6.0

2002

7.3

2004

7.3

2007

6.4

2005

7.1

1997

7.2

2002

6.4

2005

6.1

1978

0.0

2008

6.2

2008

7.6

2011

7.0

2008

8.5

1989

7.2