why don't you ring the company. I base my HPA prices on what Orbite announce. last time I looked Orbite was forecasting $45/kg, long term.
I just looked at Orbite's latest presentation of 19 June 2014, in which they have $15/kg to $30/kg
looks like my spreadsheet is outdated
http://www.orbitealuminae.com/media/upload/financials/ORT_AGM_Mgmnt-June_2014-ENG.pdf