management 2019s discussion and analysis of financial conditionand results of operations d u k e r e a l t y c o r p o r a t i o n 1 1 2 0 0 2 a n n u a l r e p o r t 2022 interest expense on the company 2019s secured debt decreased from $ 30.8 million in 2001 to $ 22.9 million in 2002 as the company paid off $ 13.5 million of secured debt throughout 2002 and experienced lower borrowings on its secured line of credit during 2002 compared to 2001 . additionally , the company paid off approximately $ 128.5 million of secured debt throughout 2001 . 2022 interest expense on the company 2019s $ 500 million unsecured line of credit decreased by approximately $ 1.1 million in 2002 compared to 2001 as the company maintained lower balances on the line throughout most of 2002 . as a result of the above-mentioned items , earnings from rental operations decreased $ 35.0 million from $ 254.1 million for the year ended december 31 , 2001 , to $ 219.1 million for the year ended december 31 , 2002 . service operations service operations primarily consist of leasing , management , construction and development services for joint venture properties and properties owned by third parties . service operations revenues decreased from $ 80.5 million for the year ended december 31 , 2001 , to $ 68.6 million for the year ended december 31 , 2002 . the prolonged effect of the slow economy has been the primary factor in the overall decrease in revenues . the company experienced a decrease of $ 12.7 million in net general contractor revenues because of a decrease in the volume of construction in 2002 , compared to 2001 , as well as slightly lower profit margins . property management , maintenance and leasing fee revenues decreased from $ 22.8 million in 2001 to $ 14.3 million in 2002 primarily because of a decrease in landscaping maintenance revenue resulting from the sale of the landscaping operations in the third quarter of 2001 . construction management and development activity income represents construction and development fees earned on projects where the company acts as the construction manager along with profits from the company 2019s held for sale program whereby the company develops a property for sale upon completion . the increase in revenues of $ 10.3 million in 2002 is primarily due to an increase in volume of the sale of properties from the held for sale program . service operations expenses decreased from $ 45.3 million in 2001 to $ 38.3 million in 2002 . the decrease is attributable to the decrease in construction and development activity and the reduced overhead costs as a result of the sale of the landscape business in 2001 . as a result of the above , earnings from service operations decreased from $ 35.1 million for the year ended december 31 , 2001 , to $ 30.3 million for the year ended december 31 , 2002 . general and administrative expense general and administrative expense increased from $ 15.6 million in 2001 to $ 25.4 million for the year ended december 31 , 2002 . the company has been successful reducing total operating and administration costs ; however , reduced construction and development activities have resulted in a greater amount of overhead being charged to general and administrative expense instead of being capitalized into development projects or charged to service operations . other income and expenses gain on sale of land and depreciable property dispositions , net of impairment adjustment , is comprised of the following amounts in 2002 and 2001 : gain on sales of depreciable properties represent sales of previously held for investment rental properties . beginning in 2000 and continuing into 2001 , the company pursued favorable opportunities to dispose of real estate assets that no longer met long-term investment objectives . in 2002 , the company significantly reduced this property sales program until the business climate improves and provides better investment opportunities for the sale proceeds . gain on land sales represents sales of undeveloped land owned by the company . the company pursues opportunities to dispose of land in markets with a high concentration of undeveloped land and those markets where the land no longer meets strategic development plans of the company . the company recorded a $ 9.4 million adjustment in 2002 associated with six properties determined to have an impairment of book value . the company has analyzed each of its in-service properties and has determined that there are no additional valuation adjustments that need to be made as of december 31 , 2002 . the company recorded an adjustment of $ 4.8 million in 2001 for one property that the company had contracted to sell for a price less than its book value . other revenue for the year ended december 31 , 2002 , includes $ 1.4 million of gain related to an interest rate swap that did not qualify for hedge accounting. .
what was the percentage change in the general and administrative expenses from 2001 to , 2002 .
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