1990

3.4

1996

6.0

1996

6.0

2009

5.3

1997

6.8

1996

6.2

2013

7.1

1995

0.0

2015

6.0

2001

6.6

1988

2.0

2003

4.3

2017

6.5

1985

7.8

2002

6.8

1988

6.2