1996

4.5

1985

6.3

2014

5.5

1994

6.2

2015

5.4

2010

3.0

2003

4.7

2005

5.1

2008

4.9

2007

6.7

1997

5.3

2009

6.0

2008

5.6

2000

7.1

1974

6.2

2009

5.4

1991

6.6

1996

3.7

2000

5.2

1999

6.7