1999

5.1

1998

3.8

1977

4.6

1997

5.9

1993

3.8

1993

4.4

2009

6.0

1986

6.3

1977

5.6

1974

6.4

1980

2.8

1974

3.6

2010

3.5

2002

4.1

1999

2.8

2006

4.6

1977

4.1

2005

0.0

1983

3.2

1995

4.6