{"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": [["( in millions )", "for the years ended december 31 , 2018", "for the years ended december 31 , 2017", "for the years ended december 31 , 2016"], ["transmission and distribution", "$ 572", "$ 551", "$ 568"], ["treatment and pumping", "231", "171", "151"], ["services meter and fire hydrants", "303", "281", "297"], ["general structure and equipment", "371", "281", "202"], ["sources of supply", "26", "54", "59"], ["wastewater", "83", "96", "34"], ["total capital expenditures", "$ 1586", "$ 1434", "$ 1311"]], "table_ori": [["", "For the Years Ended December 31,"], ["(In millions)", "2018", "2017", "2016"], ["Transmission and distribution", "$572", "$551", "$568"], ["Treatment and pumping", "231", "171", "151"], ["Services, meter and fire hydrants", "303", "281", "297"], ["General structure and equipment", "371", "281", "202"], ["Sources of supply", "26", "54", "59"], ["Wastewater", "83", "96", "34"], ["Total capital expenditures", "$1,586", "$1,434", "$1,311"]]}

Question: total transmission and distribution expenses in millions for the three year period equaled what?
Evidence:
table_1: ( in millions ) the transmission and distribution of for the years ended december 31 , 2018 is $ 572 ; the transmission and distribution of for the years ended december 31 , 2017 is $ 551 ; the transmission and distribution of for the years ended december 31 , 2016 is $ 568 ;
Program: table_sum(transmission and distribution, none)
Answer:
str_answer: 1691
exe_answer: 1691