Table 1.

Ratio (and standard error) of naturalized to native plant species on oceanic islands

Year	Ratio	SE
2000	1.07	0.11
1980	1.07	0.14
1960	0.70	0.13
1940	0.52	0.15
1920	0.44	0.09
1900	0.31	0.09
1880	0.15	0.03
1860	0.07	0.04