2003

5.5

2001

5.8

2005

6.7

2003

6.2

1993

6.4

1994

6.2

1988

7.5

1989

8.3

2001

5.4

1986

7.9

1994

6.8

2002

6.7

1995

6.5

1998

6.7

2005

6.3

2006

6.9

2004

6.3

1991

7.1

1984

7.1

1962

7.7