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In page Deforestation:

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Global deforestation[3] sharply accelerated around 1852.[4][5] As of 1947, the planet had 15 to 16 million km2 (5.8 to 6.2 million sq mi) of mature tropical forests,[6] but by 2015, it was estimated that about half of these had been destroyed.[7][8][9] Total land coverage by tropical rainforests decreased from 14% to 6%. Much of this loss happened between 1960 and 1990, when 20% of all tropical rainforests were destroyed. At this rate, extinction of such forests is projected to occur by the mid-21st century.[citation needed]