1994

6.0

1992

6.7

1995

7.0

2007

0.0

2000

4.6

2002

5.4

1996

5.7

2005

6.1

1993

7.0

1994

6.8

1975

5.9

2009

5.1

2009

5.7

1980

6.3

2004

5.9

2007

7.4

2001

6.2

2015

5.7

2008

5.1

2008

4.9