2003

6.8

2002

6.3

2004

7.2

2007

6.4

2003

5.7

2002

5.3

1993

6.4

1998

7.2

1996

6.3

2009

5.5

1995

5.8

1992

6.8

2007

6.6

1994

7.1

1996

7.4

1981

7.2

2001

6.3

2004

6.5

2004

6.1

2002

7.5