2003

7.6

2002

4.6

1990

6.1

2008

5.8

1998

6.2

1992

6.6

2002

6.2

2001

5.9

1988

6.2

2003

5.7

1997

6.2

1996

5.4

1991

6.8

1994

6.7

1996

6.5

2003

6.8

2006

5.6

2006

5.4

1993

6.7

2017

6.7