1.43 Sulfur oxide is one of the major components of the AQI measure of air quality. Table below shows sulfur dioxide emission estimates for the

years 1990, 1995, and 2000, along with major source categories (U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards). Obviously, the most important source is fuel combustion from refineries and mills. Produce a Pareto chart of source categories for these three years.
Comment on any similarities and differences you observe.

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Source Category 1990 1995 2000 Fuel combustion 20.3 16.2 14.9 Industrial processes 1.9 1.6 1.5 Transportation 1.5 1.3 1.8 Miscellaneous 0.0 0.0 0.0 Total 23.7 19.2 18.2 Note: Some columns may not sum to total due to rounding