Table 5. Productivity measures.

Measure	Q1	Q2	Q3	Q4	Q5	Q6	Q7
	1980–84	1985–89	1990–94	1995–99	2000–04	2005–09	2010–14
n articles	1,207	1,918	2,180	2,758	3,914	5,432	7,314
% change	-	58,91	13,66	26,51	41,91	38,78	34,65
Transience Index (% authors with 1 article)	83.23	78.43	77.94	77.10	76.85	78.47	78.20
% authors with 2–9 articles	15.96	20.45	20.97	21.58	21.79	20.12	20.15
% authors with >9 articles	0.81	1.12	1.09	1.32	1.36	1.41	1.65
n authors	2,111	3,574	4,420	6,154	9,371	13,959	20,145
n author change	-	+1,463	+846	+1,734	+3,217	+4,588	+6,186
% author change	-	41%	19%	28%	34%	33%	31%
n newcomers	-	3,172	3,715	5,203	7,801	11,597	16,732
% newcomers	-	89%	84%	85%	83%	83%	83%
n continuants	-	402	705	951	1,570	2,362	3,413
% continuants (Q-start)	-	19%	20%	22%	26%	25%	24%
% continuants (Q-end)	-	11%	16%	15%	17%	17%	17%
n terminators	-	1,709	2,869	3,469	4,584	7,009	10,546
% terminators	-	81%	80%	78%	74%	75%	76%
articles:author	0,57	0,54	0,49	0,45	0,42	0,39	0,36