1994

6.6

2005

5.9

2004

7.3

2006

5.6

1997

6.3

1998

6.6

1998

6.4

1984

6.8

2001

6.3

1984

5.5

2008

6.5

2014

6.4

2002

6.3

1996

6.1

2008

4.5

1996

6.1

1993

6.8

2002

5.9

2003

6.8

1991

5.7