1989

7.1

2006

5.6

1979

2.0

2005

6.9

2005

6.3

1999

4.3

1996

6.4

1994

6.1

1996

7.6

2003

5.9

2013

10.0

1997

7.0

2004

6.5

2012

4.3

1975

6.7

2001

6.1

2007

6.8

2014

7.4

1993

6.7

1984

0.0