2006

6.8

2002

5.4

1999

6.5

1994

7.1

1982

6.7

2007

5.7

1973

8.0

2003

6.6

2002

4.4

2009

4.8

1997

5.3

2008

6.7

2016

4.7

1987

6.8

1991

6.4

1999

5.7

2014

5.6

1998

5.1

2004

4.7

2014

6.5