2007

4.1

2008

6.0

1976

6.0

1985

6.5

2009

5.9

1993

5.2

2005

4.6

2014

7.1

1995

5.9

2003

7.1

1998

4.4

2005

6.3

1988

6.1

1990

6.6

1996

6.5

1997

5.2

1988

7.1

2002

5.7

2001

6.1

1993

6.8