2006

5.8

2002

6.2

1997

6.8

1998

6.5

2007

7.6

1998

7.2

2008

6.7

2004

6.5

1972

5.5

1964

5.0

2007

7.3

1973

6.9

2004

6.9

2016

5.6

2019

6.6

1974

6.8

1967

4.4

2015

3.7

2006

7.0

2003

6.3