2004

1.5

1985

5.3

2000

7.9

1995

3.0

1988

6.1

1999

6.5

2015

6.9

2007

6.0

2010

7.7

1987

5.0

2017

7.1

1997

6.5

2013

5.3

2002

5.6

2013

6.8

1989

0.0

1990

0.0

1992

6.2

2000

2.7