"Figure 21: The number of widespread invasive species has risen to 13 between 2010 and 2019","" "Number of non-native species in marine areas established in or along 10% of the total coastline, Great Britain, 1960 to 1969 and 2010 to 2019","" "","" "Notes","1. Level 1 – not/scarcely established, Level 2 – established but still generally absent or most occasional, Level 3 – established and frequent in part of the territory and Level 4 – widespread." "Unit","Number" "","" ""," Level 1"," Level 2"," Level 3"," Level 4" "1960 to 1969","6","7","2","0" "1970 to 1979","4","8","5","0" "1980 to 1989","5","4","10","1" "1990 to 1999","4","6","12","2" "2000 to 2009","3","6","19","5" "2010 to 2019","1","7","16","13"