2002

6.2

2001

7.4

1991

5.7

2007

6.2

2006

6.2

2004

5.3

1973

3.4

1996

7.0

1970

3.8

1991

4.0

2004

5.4

1978

5.9

1992

5.0

1977

4.6

2010

5.1

2008

6.8

2000

4.4

2011

6.6

2017

5.9

2003

6.6