. Suburban Propane Partners Lp had an annual average earning growth of 3.2% over the past 10 years.
Highlight of Business Operations:Combined operating and general and administrative expenses of $357.8 million for fiscal year 2012 were $26.8 million, or 8.1%, higher than the prior year, primarily as a result of the Inergy Propane Acquisition and the legal settlement referred to above, offset to an extent by lower variable compensation attributable to lower earnings and continued savings in payroll and benefit related expenses. Depreciation and amortization expense of $45.8 million increased $10.2 million, or 28.7%, primarily due to the impact of the Inergy Propane Acquisition. Net interest expense of $38.6 million for fiscal 2012 increased $11.2 million, or 40.9%, compared to the prior year as a result of higher debt levels associated with the financing for the Inergy Propane Acquisition.
Total revenues decreased $127.1 million, or 10.7%, to $1,063.5 million in fiscal 2012 compared to $1,190.6 million for fiscal 2011, primarily due to lower volumes sold and, to a much lesser extent, lower average propane selling prices. From a weather perspective, average temperatures as measured in heating degree days, as reported by the NOAA, in our service territories during fiscal 2012 were 14% and 13% warmer than normal and the prior year, respectively. Record warm temperatures were experienced throughout much of the northeast and significantly warmer than normal temperatures were reported throughout the east coast. Average temperatures in the northeast and southeast regions for fiscal 2012 were 18% and 26%, respectively, warmer than the prior year.
Revenues from the distribution of propane and related activities of $843.6 million for fiscal 2012 decreased $85.9 million, or 9.2%, compared to $929.5 million for the prior year, primarily due to lower volumes sold and lower average propane selling prices. Retail propane gallons sold in fiscal 2012 decreased 15.1 million gallons, or 5.1%, to 283.8 million gallons from 298.9 million gallons in the prior year. The volume decline was more pronounced within our residential customer base as the impact of weather has a greater effect on our residential customers propane consumption, which, during the winter, is primarily for space heating. The impact of record warm temperatures on volumes sold was offset to an extent by the addition of propane volumes sold from Inergy Propane since August 1, 2012, which contributed 27.0 million gallons of propane gallons sold in fiscal 2012. Average propane selling prices for fiscal 2012 decreased 5.0% compared to the prior year due to lower wholesale product costs. Included within the propane segment are revenues from other propane activities of $74.2 million for fiscal 2012, which decreased $2.3 million compared to the prior year.
General and administrative expenses of $59.0 million for fiscal 2012 increased approximately $7.4 million compared to $51.6 million in the prior year. General and administrative expenses for fiscal 2012 included a $4.5 million charge associated with a legal settlement (see Item 3 and Note 12 included within the Notes to the Consolidated Financial Statements section elsewhere in this Annual Report for additional discussion), and a $2.1 million non-cash charge from a loss on disposal of an asset used in our natural gas and electricity business. General and administrative expenses for fiscal 2011 included a $2.5 million gain on sale of an asset. Excluding the impact of these items, general and administrative expenses decreased $1.8 million primarily due to lower variable compensation associated with lower earnings, offset to an extent by the addition of Inergy Propane.
Revenues from the distribution of propane and related activities of $929.5 million for fiscal 2011 increased $44.0 million, or 5.0%, compared to $885.5 million for fiscal 2010, primarily as a result of higher average selling prices associated with higher product costs, partially offset by lower volumes sold. Average propane selling prices in fiscal 2011 increased 8.9% compared to the prior year due to higher product costs, thereby having a positive impact on revenues. This increase was partially offset by lower retail propane gallons sold in fiscal 2011 which decreased 19.0 million gallons, or 6.0%, to 298.9 million gallons from 317.9 million gallons in the prior year. The volume decline was primarily due to customer conservation efforts attributable to the high commodity price environment and ongoing sluggish economic conditions. Additionally, included within the propane segment are revenues from other propane activities of $76.4 million in fiscal 2011, which increased $23.8 million compared to the prior year as a result of the settlement of certain contracts used for risk management purposes (see similar increase in cost of products sold).
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