1999

5.6

2008

6.4

2006

6.9

2008

6.7

1998

4.4

1994

6.7

2005

6.3

1985

6.2

2001

6.1

1997

5.2

2000

5.5

2003

6.3

2002

5.6

1984

5.5

2016

6.1

2004

7.3

2007

6.4

1988

7.8

2005

7.1

1984

7.5