2003

6.2

2006

4.0

2017

2.0

1989

6.8

1981

5.4

2010

6.0

1997

6.5

1981

5.9

2006

7.4

1999

6.4

1998

7.1

1969

6.6

2011

5.8

1991

3.5

1967

5.5

1983

5.9

2008

3.7

2002

6.4

1997

4.9

2016

8.5