1994

6.4

2009

5.8

2007

6.8

1985

5.8

2005

6.0

1987

6.7

2001

5.5

1995

5.2

2016

3.6

1991

5.9

2004

5.5

1991

5.3

1990

6.3

1998

5.7

2003

6.4

2006

5.6

2000

4.5

1986

6.2

1988

5.5

1989

4.9