Tighter regulation means that tankers now cause fewer environmental disasters resulting from oil spills than in the 1970s. "Amoco Cadiz", , "Erika", "Exxon Valdez", "Prestige" and were examples of accidents. Oil spills from tankers amounted to around 1,000 tonnes in 2020 from three incidents (an all-time low), down from 636,000 tonnes from 92 incidents in 1979 - a fall of 99.8%.