pre_text: the following table provides a summary of our historical capital expenditures related to the upgrading of our infrastructure and systems: .
post_text: in 2018 , our capital expenditures increased $ 152 million , or 10.6% ( 10.6 % ) , primarily due to investment across the majority of our infrastructure categories . in 2017 , our capital expenditures increased $ 123 million , or 9.4% ( 9.4 % ) , primarily due to investment in our general structure and equipment and wastewater categories . we also grow our business primarily through acquisitions of water and wastewater systems , as well as other water-related services . these acquisitions are complementary to our existing business and support continued geographical diversification and growth of our operations . generally , acquisitions are funded initially with short- term debt , and later refinanced with the proceeds from long-term debt . the following is a summary of the acquisitions and dispositions affecting our cash flows from investing activities : 2022 the majority of cash paid for acquisitions pertained to the $ 365 million purchase of pivotal within our homeowner services group . 2022 paid $ 33 million for 15 water and wastewater systems , representing approximately 14000 customers . 2022 received $ 35 million for the sale of assets , including $ 27 million for the sale of the majority of the o&m contracts in our contract services group during the third quarter of 2018 . 2022 the majority of cash paid for acquisitions pertained to the $ 159 million purchase of the wastewater collection and treatment system assets of the municipal authority of the city of mckeesport , pennsylvania ( the 201cmckeesport system 201d ) , excluding a $ 5 million non-escrowed deposit made in 2016 . 2022 paid $ 18 million for 16 water and wastewater systems , excluding the mckeesport system and shorelands ( a stock-for-stock transaction ) , representing approximately 7000 customers . 2022 received $ 15 million for the sale of assets . 2022 paid $ 199 million for 15 water and wastewater systems , representing approximately 42000 customers . 2022 made a non-escrowed deposit of $ 5 million related to the mckeesport system acquisition . 2022 received $ 9 million for the sale of assets . as previously noted , we expect to invest between $ 8.0 billion to $ 8.6 billion from 2019 to 2023 , with $ 7.3 billion of this range for infrastructure improvements in our regulated businesses . in 2019 , we expect to .
table: For the Years Ended December 31,
table: (In millions) 2018 2017 2016
table: Transmission and distribution $572 $551 $568
table: Treatment and pumping 231 171 151
table: Services, meter and fire hydrants 303 281 297
table: General structure and equipment 371 281 202
table: Sources of supply 26 54 59
table: Wastewater 83 96 34
table: Total capital expenditures $1,586 $1,434 $1,311
question: Analyse this data from a financial earnings document. what percentage of total capital expenditures were related to transmission and distribution in 2018?