What is the change in Small and Medium Business value from 2018 to 2019?
{"Global Enterprise ": {"2019": 10818.0, "2018": 11201.0, "2019 vs. 2018": -383.0, "": -3.4}, "Small and Medium Business ": {"2019": 11464.0, "2018": 10752.0, "2019 vs. 2018": 712.0, "": 6.6}, "Public Sector and Other ": {"2019": 5922.0, "2018": 5833.0, "2019 vs. 2018": 89.0, "": 1.5}, "Wholesale ": {"2019": 3239.0, "2018": 3748.0, "2019 vs. 2018": -509.0, "": -13.6}, "Total Operating Revenues(1) ": {"2019": 31443.0, "2018": 31534.0, "2019 vs. 2018": -91.0, "": -0.3}, "Connections (000):(2) -- Wireless retail postpaid connections ": {"2019": 25217.0, "2018": 23492.0, "2019 vs. 2018": 1725.0, "": 7.3}, "Connections (000):(2) -- Fios Internet connections ": {"2019": 326.0, "2018": 307.0, "2019 vs. 2018": 19.0, "": 6.2}, "Connections (000):(2) -- Fios video connections ": {"2019": 77.0, "2018": 74.0, "2019 vs. 2018": 3.0, "": 4.1}, "Connections (000):(2) -- Broadband connections ": {"2019": 489.0, "2018": 501.0, "2019 vs. 2018": -12.0, "": -2.4}, "Connections (000):(2) -- Voice connections ": {"2019": 4959.0, "2018": 5400.0, "2019 vs. 2018": -441.0, "": -8.2}, "Net Additions in Period (000):(3) -- Wireless retail postpaid ": {"2019": 1391.0, "2018": 1397.0, "2019 vs. 2018": -6.0, "": -0.4}, "Net Additions in Period (000):(3) -- Wireless retail postpaid phones ": {"2019": 698.0, "2018": 625.0, "2019 vs. 2018": 73.0, "": 11.7}, "Churn Rate: -- Wireless retail postpaid ": {"2019": 1.24, "2018": 1.19, "2019 vs. 2018": "", "": ""}, "Churn Rate: -- Wireless retail postpaid phones ": {"2019": 0.99, "2018": 0.98, "2019 vs. 2018": "", "": ""}}
small_and_medium_business_2019 = df["Small and Medium Business "]["2019"]
small_and_medium_business_2018 = df["Small and Medium Business "]["2018"]
answer = small_and_medium_business_2019 - small_and_medium_business_2018