Currently I am working on Cash Value Added $($CVA$)$ calculations and am struggling on how to calculate the operating cash flow demand factor $($OCFD$).$ we were given an example but there isn't any direction in calculating it$.$

the stratgic inestment in this case $100$ Table $9\mathrm{.}1$ An illustration of CVA calculation

$\backslash$table$[[,1997,1998,1999,2000,2001,2002,2003,2004],[$Sales$,,160,170,250,185,200,215,200],[$Less: Costs,$-150,-150,-220,-160,-170,-180,-155,],[$Operating surplus,$10,15,30,25,30,35,45,],[$Less: Working capital movement,$0,-1,-6,5,-1,-1,1,],[$Less: Non$-$strategic investments,$-1,-3,-1,-3,-12,-4,-3,],[$Operating cash flow,$9,11,23,27,17,30,43,],[$Less: Operating cash flow demand,$17,18,18,19,19,20,20,],[$Cash value added,$-8,-6,5,8,-2,10,23,],[$CVA index,,$-8,-6,1\mathrm{.}29,1\mathrm{.}42,0\mathrm{.}88,1\mathrm{.}51,2\mathrm{.}11],[$Average discounted CVA index,$-100,1\mathrm{.}10,0\mathrm{.}64,1\mathrm{.}20,,,,],[$Strategic investments,,,,,,,,$],[$Cash flow,$-100,9,11,23,27,17,30,43]]$