According to this graph of the population growth of fur seals, in what year did the population first reach its carrying capacity? 
Definitions:
Sinkholes
Natural depressions or holes in the Earth's surface caused by the removal of soil and bedrock, often due to water erosion.
Methane Gas
A colorless, odorless flammable gas that is a major component of natural gas, potent greenhouse gas contributing to global warming.
Coal Beds
Layers or seams of coal, a fossil fuel formed from the remains of ancient vegetation, which have been compacted and naturally processed in the Earth over millions of years.
Calcium Carbonate
A chemical compound with the formula CaCO3, a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone) and is the main component of pearls and the shells of marine organisms, snails, and eggs.
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