The National Parks Project

7.89

/

1965

7.029

/

2003

6.735

/

2003

6.463

/

2012

6.5

/

1996

7.528

/

2008

6.867

/

2017

6.93

/

2013

6.935

/

2010

7.5

/

2012

8.3

/

2019

5.2

/

2020

6.408

/

2006

6.674

/

2005

5.836

/

2012

5.992

/

2009

5.878

/

1991

8.564

/

1993

6.063

/

2009

6.808

/

2017

5.9

/

2014

5.6

/

2007

5.7

/

2014

6.795

/

2004

7.077

/

2004

6.714

/

2014

6.668

/

1983

1

/

2013

6.8

/

1992

6.5

/

2003

5

/

2004

7

/

2014

5.4

/

2011

5.6

/

2008

8.7

/

2014

9.5

/

1983

5.7

/

2008

4.9

/

2004

5.2

/

1982

7.536

/

1996