Library of Congress

6.3

/

2016

3.3

/

2007

6.287

/

2015

5.2

/

2008

10

/

2021

7

/

2003

5

/

1973

6.884

/

2013

4.5

/

2021

6.447

/

2015

6.5

/

2006

4.514

/

2016

4

/

NaN

5

/

1998

5

/

2002

9.75

/

2013