Table 2. Estimated number of travel-related cases of chikungunya that could have led to secondary transmissions on the basis of cases reported during June–October and proportion of population in countries in which Aedes albopictus mosquitoes are established, per year and reporting country, 2012–2018.

Characteristic, year	France	Germany	Greece	Italy	Malta	Slovenia	Spain	Total
No. travel-related case during June–October
2012	7	3	0	2	0	0	0	12
2013	6	0	0	3	0	0	1	10
2014	540	85	1	0	0	0	180	806
2015	35	29	0	9	0	0	87	160
2016	16	28	1	9	0	1	31	86
2017	10	11	0	3	0	0	14	38
2018	5	7	1	2	0	0	2	17
% Population in regions in which Ae. albopictus mosquitoes are established
2012	21	0	6	83	92	11	20	28
2013	23	0	17	84	93	11	20	29
2014	25	0	25	86	93	14	20	31
2015	34	0	27	81	93	31	30	34
2016	36	0	76	99	93	57	33	41
2017	43	0	49	100	93	57	42	43
2018	55	1	83	100	93	57	42	45
Estimated no. cases in regions in which Ae. albopictus are established
2012	1	0	0	2	0	0	0	3
2013	1	0	0	3	0	0	0	4
2014	135*	0	0	0	0	0	36	171
2015	12	0	0	7	0	0	26	45
2016	6	0	1	9	0	1	10	26
2017	4*	0	0	3*	0	0	6	13
2018	3	0	1	2	0	0	1	6
Total no. cases in regions in which Ae. albopictus are established
2012–2018	163	0	2	25	0	1	79	270

*When an outbreak occurred.