1996

6.4

1993

5.1

1993

6.2

1994

7.2

2004

7.9

2015

3.7

1993

7.7

2010

6.8

1992

6.7

2005

7.5

2009

7.9

2002

7.9

2008

7.5

1996

6.0

1998

7.1