Table 2.

Number of new nodes and percentage of edges from new nodes over time and by scientific domain.

	SSH
	2011->2012	2012->2013	2013->2014	2014->2015	2015->2016
New nodes	114	110	108	118	101
% new links from new nodes	2.8	2.7	3.4	4	3.3
	PE
	2011->2012	2012->2013	2013->2014	2014->2015	2015->2016
New nodes	112	102	85	74	97
% new links from new nodes	1.9	2	1.9	2	2.7
	LS
	2011->2012	2012->2013	2013->2014	2014->2015	2015->2016
New nodes	81	76	89	80	72
% new links from new nodes	1.6	1.9	2.1	2.7	2.5
	MS
	2011->2012	2012->2013	2013->2014	2014->2015	2015->2016
New nodes	102	112	110	103	102
% new links from new nodes	2.7	4.6	4.6	4.3	5.3

New edges can emerge from and connect to any node, old or new.