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The image shows fuel production levels (in tonnes) for petroleum, coal, and natural gas from 1981 to 2000. Petroleum: 1981-100, 1982-102, 1983-102, 1984-103, 1985-102, 1986-100, 1987-90, 1988-85, 1989-85, 1990-83, 1991-85, 1992-87, 1993-85, 1994-90, 1995-100, 1996-108, 1997-108, 1998-110, 1999-106, 2000-103. Coal: 1981-120, 1982-125, 1983-125, 1984-125, 1985-125, 1986-120, 1987-120, 1988-100, 1989-90, 1990-95, 1991-90, 1992-90, 1993-65, 1994-60, 1995-60, 1996-62, 1997-63, 1998-60, 1999-50, 2000-45. Natural gas: 1981-0, 1982-0, 1983-0, 1984-0, 1985-0, 1986-10, 1987-10, 1988-15, 1989-15, 1990-30, 1991-35, 1992-33, 1993-30, 1994-30, 1995-32, 1996-33, 1997-27, 1998-25, 1999-20, 2000-25.
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The graph below illustrates the producing levels of petroleum, coal and natural gas in a European country over a period of 21 years.
It is clear that petroleum was by far the most essential means of fuel production over the period shown. Natural gas provided the lowest consumption in tonnes almost in each year, while coal fabrication hold stable indicator over this period.
Petroleum make quickly boomed around 95 tonnes to 130 tonnes between 1981 and 1983 . However over period of 2 years this dipictured dramatic dove from 130 tonnes to 90 tonnes.
In the year 1985 coal production were about 50 tonnes and rapidly surged to 70 tonnes in 1987. Over a 9-year period gradually declined by 40 tonnes . Natural gas production remained constant indicators between 1981 and 1994 . From 1957 natural gas fabrication steadily increased by 80 tonnes
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