pre_text: Management Discussion and Analysis Cash Flow "nm" denotes not meaningful Note: (1) Refers to Singtel Group excluding Optus. The Group’s free cash flow grew 1.2% to S$3.65 billion. The increase was driven by lower capital expenditure partly offset by lower operating cash flow, higher cash taxes and lower associates’ dividends. Net cash inflow from operating activities declined 9.9% to S$5.37 billion. Dividends received from the associates fell 6.0% mainly from Telkomsel, the Southern Cross consortium and NetLink Trust. 
  
  Net cash inflow from operating activities declined 9.9% to S$5.37 billion. Dividends received from the associates fell 6.0% mainly from Telkomsel, the Southern Cross consortium and NetLink Trust. The investing cash outflow was S$2.33 billion. During the year, Singtel received proceeds of S$118 million from the disposal of a property in Singapore. Payments of S$123 million were made for the acquisition of Videology assets in August 2018 and S$344 million for the acquisition of a 5.7% equity interest in Airtel Africa in October 2018. Capital expenditure totalled S$1.72 billion, comprising S$587 million for Singtel and S$1.13 billion (A$1.14 billion) for Optus. In Singtel, major capital investments in the year included S$215 million for fixed and data infrastructure, S$183 million for mobile networks and S$189 million for ICT and other investments.  The investing cash outflow was S$2.33 billion. During the year, Singtel received proceeds of S$118 million from the disposal of a property in Singapore. Payments of S$123 million were made for the acquisition of Videology assets in August 2018 and S$344 million for the acquisition of a 5.7% equity interest in Airtel Africa in October 2018. Capital expenditure totalled S$1.72 billion, comprising S$587 million for Singtel and S$1.13 billion (A$1.14 billion) for Optus. In Singtel, major capital investments in the year included S$215 million for fixed and data infrastructure, S$183 million for mobile networks and S$189 million for ICT and other investments. In Optus, capital investments in mobile networks amounted to A$633 million with the balance in fixed and other investments. 
  
  In Optus, capital investments in mobile networks amounted to A$633 million with the balance in fixed and other investments. Net cash outflow for financing activities amounted to S$3.06 billion. Major cash outflows included net interest payments of S$385 million, and payments of S$1.75 billion for final dividends in respect of FY 2018 and S$1.11 billion for interim dividends in respect of FY 2019, partly offset by increase in net borrowings of S$222 million.
table: Financial Year ended 31 March
table: 2019 2018 Change
table: (S$ million) (S$ million) (%)
table: Net cash inﬂow from operating activities 5,368 5,955 -9.9
table: Net cash outﬂow for investing activities (2,329) (1,951) 19.4
table: Net cash outﬂow for ﬁnancing activities (3,056) (4,009) -23.8
table: Net change in cash balance (16) (5) 248.9
table: Exchange effects on cash balance 4 (4) nm
table: Cash balance at beginning of year 525 534 -1.7
table: Cash balance at end of year 513 525 -2.3
table: Singtel (1) 1,242 1,126 10.3
table: Optus 1,006 989 1.8
table: Associates (net dividends after withholding tax) 1,402 1,492 -6.0
table: Group free cash ﬂow 3,650 3,606 1.2
table: Optus (in A$ million) 1,028 947 8.5
table: Cash capital expenditure as a percentage of operating revenue 10% 14%
question: Analyse this data from a financial earnings document. What is the average net change in cash balance across the 2 years?