1994

8.0

2002

7.7

2004

7.9

1993

7.1

1996

6.8

1997

7.0

2008

7.6

1979

6.7

2002

6.9

2011

5.9

2001

8.1

1996

5.3

1989

8.3

2012

6.1

1993

8.4

1998

7.2

1996

1.0