Year	Type	Above settlements	Below settlements	All sites
2008	With 55	2.555	3.227	2.913
2009	With 55	2.492	2.999	2.762
2010	With 55	2.455	2.766	2.621
2011	With 55	2.629	3.05	2.854
2012	With 55	2.747	3.844	3.332
2013	With 55	2.735	3.357	3.066
2014	With 55	2.968	4.121	3.583
2015	With 55	2.448	3.858	3.2
2016	With 55	2.59	4.186	3.441
2017	With 55	2.754	4.021	3.429
2008	Without 55	2.555	3.064	2.821
2009	Without 55	2.492	2.871	2.69
2010	Without 55	2.455	2.606	2.534
2011	Without 55	2.629	2.809	2.723
2012	Without 55	2.747	3.443	3.111
2013	Without 55	2.735	3.029	2.888
2014	Without 55	2.968	3.478	3.235
2015	Without 55	2.448	3.198	2.84
2016	Without 55	2.59	3.299	2.96
2017	Without 55	2.754	3.264	3.02