2002

6.1

1986

5.9

2003

6.0

2003

6.2

1978

6.6

2007

7.3

1979

5.7

2001

5.2

2005

6.8

2000

5.2

1992

5.8

1996

6.6

2004

6.2

1995

7.1

1987

6.8

1999

6.2

2003

5.2

2005

5.4

2006

5.2

1993

6.0