Table 3. The number of citizen science projects for each topic from 1997 to 2014.

Topic	1997–1999	2000–2002	2003–2005	2006–2008	2009–2011	2012–2014	All Years
Astronomy	0	0	0	0	10	34	44
Environment	0	0	1	5	9	37	52
Biology	3	3	11	16	60	234	327
Medical	0	0	0	0	1	8	9
Others	0	0	0	0	4	20	24
Total	3	3	12	21	84	333	456
Break-down of Biology Category
Avian	3	2	6	8	22	70	111
Marine	0	0	1	1	10	42	54
Terrestrial invertebrates	0	1	3	4	13	56	77
Herpetology	0	0	0	1	2	7	10
Plants	0	0	0	1	6	29	36
Mammals	0	0	1	0	6	28	35
Other Animals	0	0	0	1	1	2	4