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Strategy for England’s Wildlife and Ecosystem Services, Biodiversity 2020 indicatorsTrends in pressure on biodiversity - invasive species

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year	Number of invasive species established Not or scarcely established Fresh water	Number of invasive species established Established but still generally absent or at most occasional Fresh water	Number of invasive species established Established and frequent in part of the territory Fresh water	Number of invasive species established Widespread Fresh water	Number of invasive species established Not or scarcely established Marine	Number of invasive species established Established but still generally absent or at most occasional Marine	Number of invasive species established Established and frequent in part of the territory Marine	Number of invasive species established Widespread Marine	Number of invasive species established Not or scarcely established Terrestrial	Number of invasive species established Established but still generally absent or at most occasional Terrestrial	Number of invasive species established Established and frequent in part of the territory Terrestrial	Number of invasive species established Widespread Terrestrial
1960-69	10	4	3	1	6	7	2	0	33	29	20	8
1970-79	8	8	5	1	4	8	5	0	23	34	26	11
1980-89	7	6	10	1	5	4	10	1	19	35	26	19
1990-99	8	8	10	2	5	5	12	2	18	31	29	23