1970

4.5

2011

7.5

2004

5.7

2008

7.0

2017

6.3

2007

4.4

2010

6.5

2012

5.6

1998

3.7

2003

6.2

2011

6.5

1998

4.9

2021

7.9

1966

7.3

1958

7.6

1995

7.7

1953

7.9

1999

7.7

2016

6.2

2013

7.3