2001

4.9

2005

5.8

2008

5.0

1999

7.5

1995

6.5

2007

6.1

2015

5.7

2015

6.0

1977

4.2

1991

7.3

2004

5.9

1986

6.1

1997

6.5

2013

0.0

1995

1.5

1992

7.1

1989

3.7

2003

5.1

1983

5.2

2004

5.3