1998

4.8

2006

7.0

7.8

2017

6.0

2008

7.4

2005

7.3

1999

5.1

2003

5.0

2008

6.2

1973

7.5

2000

4.6

2014

6.8

2010

5.2

1969

6.6

2009

7.9

2010

6.9

2021

6.2

1966

5.5

2013

6.1