1985

7.1

2013

4.9

2004

2.0

1995

4.6

1967

4.2

2008

4.7

2008

6.3

2014

3.3

2002

3.4

1987

5.2

2010

6.3

1999

2.7

1988

5.0

1989

2.9

1999

3.7

1992

4.0

1989

5.0

2017

3.9

2017

4.7

1990

5.7